GMS1 WITH MODS... what you got?
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From: the north
GMS1 WITH MODS... what you got?
08 TC with GMS1, HAHN Catless DP, Full 3" street exhaust, CoolRam Intake. (and CM Coil Springs).
First Install was the HAHN CoolRam - it brought out the sound of the turbo, especially inside the vehicle. Noticed some minor surging at idle every now and then too which never went away.
Second was GMS1 - HUUUUGE difference in power. Im a GM tech so was the best choice for me, and the car is still under warranty with only 20,000mi.
Third I installed the Catless downpipe and 3" full street exhaust (with resonator & muffler). Noticed a bit more power. I noticed it was louder during warmup, quieter at idle, and significantly louder at WOT. The note given off at WOT is very unique and head-turning.
Im looking into the HAHN Intercooler and IC piping....
Does anybody happen to have the GMS1 and the same or similar combination?
Would like to know if Im going to have any drivability issues by adding an intercooler and piping? Is it worth the money or not at all?
First Install was the HAHN CoolRam - it brought out the sound of the turbo, especially inside the vehicle. Noticed some minor surging at idle every now and then too which never went away.
Second was GMS1 - HUUUUGE difference in power. Im a GM tech so was the best choice for me, and the car is still under warranty with only 20,000mi.
Third I installed the Catless downpipe and 3" full street exhaust (with resonator & muffler). Noticed a bit more power. I noticed it was louder during warmup, quieter at idle, and significantly louder at WOT. The note given off at WOT is very unique and head-turning.
Im looking into the HAHN Intercooler and IC piping....
Does anybody happen to have the GMS1 and the same or similar combination?
Would like to know if Im going to have any drivability issues by adding an intercooler and piping? Is it worth the money or not at all?
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Joined: 09-24-10
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From: Alberta
08 TC with GMS1, HAHN Catless DP, Full 3" street exhaust, CoolRam Intake. (and CM Coil Springs).
First Install was the HAHN CoolRam - it brought out the sound of the turbo, especially inside the vehicle. Noticed some minor surging at idle every now and then too which never went away.
Second was GMS1 - HUUUUGE difference in power. Im a GM tech so was the best choice for me, and the car is still under warranty with only 20,000mi.
Third I installed the Catless downpipe and 3" full street exhaust (with resonator & muffler). Noticed a bit more power. I noticed it was louder during warmup, quieter at idle, and significantly louder at WOT. The note given off at WOT is very unique and head-turning.
Im looking into the HAHN Intercooler and IC piping....
Does anybody happen to have the GMS1 and the same or similar combination?
Would like to know if Im going to have any drivability issues by adding an intercooler and piping? Is it worth the money or not at all?
First Install was the HAHN CoolRam - it brought out the sound of the turbo, especially inside the vehicle. Noticed some minor surging at idle every now and then too which never went away.
Second was GMS1 - HUUUUGE difference in power. Im a GM tech so was the best choice for me, and the car is still under warranty with only 20,000mi.
Third I installed the Catless downpipe and 3" full street exhaust (with resonator & muffler). Noticed a bit more power. I noticed it was louder during warmup, quieter at idle, and significantly louder at WOT. The note given off at WOT is very unique and head-turning.
Im looking into the HAHN Intercooler and IC piping....
Does anybody happen to have the GMS1 and the same or similar combination?
Would like to know if Im going to have any drivability issues by adding an intercooler and piping? Is it worth the money or not at all?
You won't get much higher (if any higher at all iirc) than 280hp/320tq with a GMS1 tune with additional mods but you might get a little extra on the low end.
You're going to be louder at warmup because your car is still running the cat warmup cycle but you're catless so it's useless and people get that taken out with aftermarket tunes.
Screw the HAHN intercooler and piping, ZZP is cheaper and better quality. At least replace the intercooler because the stock one has plastic end tanks that have been know to blow under stock boost or just hitting a bump. The piping won't do much for you but that's all preference, I replaced mine anyways. My full ZZP intercooler kit was ~$900 shipped.
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Joined: 03-17-12
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From: Wilkes Barre, Pa
I have Hahn catless dp and k&n Sri and I have no problems...however you actually may be losing a little power with the exhaust...from what I've been told full exhaust in 3 inch is pointless unless bigger turbo and all Is happening...and for bother upgrading the ic or pipin I have no problems...ic and piping is more or less for show on these cars
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From: the north
I have Hahn catless dp and k&n Sri and I have no problems...however you actually may be losing a little power with the exhaust...from what I've been told full exhaust in 3 inch is pointless unless bigger turbo and all Is happening...and for bother upgrading the ic or pipin I have no problems...ic and piping is more or less for show on these cars
Thanks for the input. What IC and pipes did you go with?
With that HAHN intake I would check your air to fuel ratios. You're probably running rich or lean. Every body likes the K&N SRI because you can turn the filter a certain way to not have to retune for your AFRs.
You won't get much higher (if any higher at all iirc) than 280hp/320tq with a GMS1 tune with additional mods but you might get a little extra on the low end.
You're going to be louder at warmup because your car is still running the cat warmup cycle but you're catless so it's useless and people get that taken out with aftermarket tunes.
Screw the HAHN intercooler and piping, ZZP is cheaper and better quality. At least replace the intercooler because the stock one has plastic end tanks that have been know to blow under stock boost or just hitting a bump. The piping won't do much for you but that's all preference, I replaced mine anyways. My full ZZP intercooler kit was ~$900 shipped.
You won't get much higher (if any higher at all iirc) than 280hp/320tq with a GMS1 tune with additional mods but you might get a little extra on the low end.
You're going to be louder at warmup because your car is still running the cat warmup cycle but you're catless so it's useless and people get that taken out with aftermarket tunes.
Screw the HAHN intercooler and piping, ZZP is cheaper and better quality. At least replace the intercooler because the stock one has plastic end tanks that have been know to blow under stock boost or just hitting a bump. The piping won't do much for you but that's all preference, I replaced mine anyways. My full ZZP intercooler kit was ~$900 shipped.
If I buy anything its going to be HAHN. I dont like having mix match parts on my car. Really dont even want anything aftermarket... but thats boring.
Last edited by guitarenvy; Mar 25, 2013 at 08:38 PM.
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Joined: 09-17-11
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From: Cincinnati Oh
You've got to make a decision... do you want the best part or do you want all the same logos on your car?
ZZP Intercooler + Charge Pipes (ZZP or Injen) + HP Tune + = Happy LNF
Even if you tune "conservatively" you'd get the $ back in the performance you're missing out on w/GMS1.
ZZP Intercooler + Charge Pipes (ZZP or Injen) + HP Tune + = Happy LNF
Even if you tune "conservatively" you'd get the $ back in the performance you're missing out on w/GMS1.
I have Hahn catless dp and k&n Sri and I have no problems...however you actually may be losing a little power with the exhaust...from what I've been told full exhaust in 3 inch is pointless unless bigger turbo and all Is happening...and for bother upgrading the ic or pipin I have no problems...ic and piping is more or less for show on these cars
turbo cars will always benefit from a 3" exhaust, not lose power. unless we are talking about a 1.4L engine with a k03 baby turbo.
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Joined: 03-17-12
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From: Wilkes Barre, Pa
I know turbo cars benefit from bigger exhaust however I have been told out cars are sketchy with bigger exhaust...no one ever gave me a straight answer it's just what multiple people have told me
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Joined: 03-14-11
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From: Halifax, NS
what? You've been told wrong. The 3in exhaust isnt going to see much power gain because the stock exhaust is already pretty much straight through and 2.75" in diameter (rated 2.5").
turbo cars will always benefit from a 3" exhaust, not lose power. unless we are talking about a 1.4L engine with a k03 baby turbo.
turbo cars will always benefit from a 3" exhaust, not lose power. unless we are talking about a 1.4L engine with a k03 baby turbo.
Last edited by nobody2u; Mar 26, 2013 at 05:05 PM.
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From: Moline IL
With that HAHN intake I would check your air to fuel ratios. You're probably running rich or lean. Every body likes the K&N SRI because you can turn the filter a certain way to not have to retune for your AFRs.
You won't get much higher (if any higher at all iirc) than 280hp/320tq with a GMS1 tune with additional mods but you might get a little extra on the low end.
You're going to be louder at warmup because your car is still running the cat warmup cycle but you're catless so it's useless and people get that taken out with aftermarket tunes.
Screw the HAHN intercooler and piping, ZZP is cheaper and better quality. At least replace the intercooler because the stock one has plastic end tanks that have been know to blow under stock boost or just hitting a bump. The piping won't do much for you but that's all preference, I replaced mine anyways. My full ZZP intercooler kit was ~$900 shipped.
You won't get much higher (if any higher at all iirc) than 280hp/320tq with a GMS1 tune with additional mods but you might get a little extra on the low end.
You're going to be louder at warmup because your car is still running the cat warmup cycle but you're catless so it's useless and people get that taken out with aftermarket tunes.
Screw the HAHN intercooler and piping, ZZP is cheaper and better quality. At least replace the intercooler because the stock one has plastic end tanks that have been know to blow under stock boost or just hitting a bump. The piping won't do much for you but that's all preference, I replaced mine anyways. My full ZZP intercooler kit was ~$900 shipped.
Start up makes my car run horrible until like the 10 second mark.. after that.. my car runs like a beast and idles great
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From: St.Paul minnesnowta
i have GMS1 with hahn DP and cat back. if you think it sounds great at WOT,i took the hahn muffler off and put a high flow muffler on and its sounds 10x better.
i have a custom (research and development from a local shop) ic pipe and a modern performance intercooler WAITING to be put on.
i was going to buy an intercooler but my friend was parting his balt out so i swooped his intercooler.
from the research ive done on intercoolers(before i figured out i was buying my friends) i was going to go with ZZP.
i have a custom (research and development from a local shop) ic pipe and a modern performance intercooler WAITING to be put on.
i was going to buy an intercooler but my friend was parting his balt out so i swooped his intercooler.
from the research ive done on intercoolers(before i figured out i was buying my friends) i was going to go with ZZP.
Senior Member
Joined: 08-20-10
Posts: 1,052
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From: san antonio TEXAS
GMS1 + MPx Catless DP ( on for about 35k miles) + K&N SRI ( on for almost 20k miles)
only normal "cobalt" problems so far like crappy brake ware/e-brake.
key stuck in ignition, and evap solenoid
need the fuel pump recall next, and some serious 50k mile maintenance and TLC
only normal "cobalt" problems so far like crappy brake ware/e-brake.
key stuck in ignition, and evap solenoid
need the fuel pump recall next, and some serious 50k mile maintenance and TLC
Last edited by Gobolt210; Mar 27, 2013 at 07:06 PM.
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Joined: 07-17-12
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From: Fredericksburg, VA
When your upping boost swapping out the downpipe is always a good idea you wanna get the exhaust out as efficiently as possible. I have Dejon charge pipes and a TR8 intercooler and they have been great give me look and performance. I agree with ZWK2013 that HPT is the way to go as well because you can always reflash your stock tune back on there if need be
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From: ottawa,ontario
Stage 1 , hahn catted dp , fl 3 inch , aem intake , treadstone ic/piping with 50 mm bov , lightweight crank pulley . No maf relocate cars run awesome . Only problem was figuring out the bov and it works how it should now . And I have out ran trifecta tuned balts etcc . So personal preference if u wanna keep getting tuned all the time or have a daily driver with warrenty . Mine was dyno'd a while back without half of my bolt ons now and I was 270/293 numbers . Only had an intake and piping .
Stage 1 , hahn catted dp , fl 3 inch , aem intake , treadstone ic/piping with 50 mm bov , lightweight crank pulley . No maf relocate cars run awesome . Only problem was figuring out the bov and it works how it should now . And I have out ran trifecta tuned balts etcc . So personal preference if u wanna keep getting tuned all the time or have a daily driver with warrenty . Mine was dyno'd a while back without half of my bolt ons now and I was 270/293 numbers . Only had an intake and piping .
Trifecta, Zzp downpipe, k&n intake , Hahn upper charge pipe, I forget the lower pipe, Zzp intercooler.
To all Hahn ic pipe inquiry's, they rust inside. Do what u will with that info
To all Hahn ic pipe inquiry's, they rust inside. Do what u will with that info