hey guys, i have a 2.4 ss with the gmp catback, planning on getting the gmp header and i'm just not sure which downpipe to go with. i know i can stuck with stock but i'd rather get as much out of my upgrades as possible. anyone know the best downpipe(s) to go with the gmp header?

 

The XTC Downpipe with cat seems to be the best buy, i have one myself. You can get them at cobalt addiction

 

ya thats the one i was looking at getting. the price is good and everything, i just wasnt sure if it would be a good fit. what kinda gains u think would come from it?

 

hmm i dont know the exact hp gain but i know its decent from the high flow cat and slightly bigger piping. also i would recommend not getting the GMPP header because the CA header would be quite a bit better and much cheaper too..

 

do you have any problems with c.e.l.?

 

yes i did (it came up after 20 mins of driving with the new dp), but i got it cleared with HPtuner. you can also get a CEL fix thingie from ark performance

 

hmm.... in your sig it says you have a vibrant downpipe....

 

haha i called it vibrant coz it has vibrant written all over it

 

go with the c/a downpipe..yes the c/a downpipes are magnaflow piping, vibrant flanges,cat and flex pipe.

 

zzp works great for me

 

The XTC from cobalt addiction been running mine for over a year now no promblems. I have disabled the cell via HPT.

 

yo red..wut codes do i have to disable for the cel to disble?

 

In the VCM scanner, click on the DTC box and it will tell you what codes you have thrown. I have all of mine set to report no error.

 

the only one i throw is the p0420, how can i just disable the rear o2

 

VCM Editor>Engine Diagnostics>DTC's

Scroll down to the P0420 code to the right there will be a drop down with some options, set to report no error

 

u didnt get it...there are several codes that u have to disable to disable the rear o2...p0420 is just one of the codes

 

gmp header = ****

vibrant #1 no one had a problem jat

and i gained 14whp and 14wtq with my vibrant

 

i can't tell you what codes to turn off since i don't know what codes are thrown I've told you how to do it already

 

zzp midlength combo is workin great for me and its way cheaper than buyin a header and dp seperate plus with a midlength setup you see more overall torque across a broader band

 

so basically regardless of the engine i have i should just get the vibrant probably...midlength header. i saw ur gains from it but uve got the lsj whereas im just an LE5. what kinda gains would u expect from me.....like i said before, im runnin the gmpp exhaust....only 2.25 diameter :S

 

about same gains

with vibrant header downpipe and GMPP exhaust u should be at least 20hp+

plz dont go with gm header ..... vibrant is not cheap but no one ever had a problem with flex pipe going bad like other company's

plus TTR has a great deal on it and all ecotec can hook u up as well with sick shipping

good luck

 

now im an idiot, so i rly dont know this...u can flame me all u want but i dont care! lol....anyways the vibrant downpipe/header combo comes with a cat converter. doesnt the gmp exhaust also? i looked at the pics and everything, looks like it does but im ignorant when it comes to this stuff so far. am i right?

and stage2, what part of canada u from?

 

I love my XTC 2.5" de-cat downpipe. Its been on my car since November '06, and no problems to date.

 

Windsor

and no GMPP exhaust dose not come with a cat

GMPP exhaust comes with a resonator and a muffler
but when u get a vibrant header downpipe it comes with a cat

here is a pic how it looks stock vs vibrant

 

alright man sweet. would u recommend goin to a dealer or how do u think i should install it if/when i get it? i dont really have any experience with this but if there was step by step instructions i think i could handle it myself, idk. has anyone on here installed their own? how hard is it. im assuming u installed ur own since i see you have it all laid out there and everything...lol