Downpipe and Intake advice
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Downpipe and Intake advice
I just got my 2009 SS Sedan this past weekend and it's completely stock besides gms1. Which isn't necessarily a bad thing it's actually what I was looking for. Does anyone have any advice on what kind of dp and intake to get? I was thinkg zzp catless dp and a k&n intake but I wasn't sure. Also what other supporting mods would yall suggest? Thanks!!! 
welcome.
your 2 choices are the best ones.
1. Bad mab downpipe is good quality and cheaper.
2. Hahn or turbo-xs is a great set-up for both as well but much more expensive for their downpipes and intakes.
3. get some coilovers and a short throw shifter.
4. you will be good for a while, but then you will want a custom tune and a bigger turbo, but until then, have fun.
your 2 choices are the best ones.
1. Bad mab downpipe is good quality and cheaper.
2. Hahn or turbo-xs is a great set-up for both as well but much more expensive for their downpipes and intakes.
3. get some coilovers and a short throw shifter.
4. you will be good for a while, but then you will want a custom tune and a bigger turbo, but until then, have fun.
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Joined: 12-26-11
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From: Thunder Bay
k&n forsure, then pick a company and if they make corresponding parts as well in my opinion. like in my case i picked the turbo xs catted dp so i can stay legal, and bought the turboxs fl exhaust. sounds amazing, its a full 3" stainless steel exhaust i got for about 700$. so 2 each there own but thats my 2 cents
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Senior Member
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From: St.Paul minnesnowta
K&N SRI seems to be a popular choice. it was the first mod i bought for my car and haven't seconds guessed it once. sounds amazing too.
wait til you get the intake and DP on. cheeks might hurt from all the smiling you will be doing
wait til you get the intake and DP on. cheeks might hurt from all the smiling you will be doing
Senior Member
Joined: 03-14-11
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From: Halifax, NS
I have the K&N and ZZP catless myself. No problems or issues to report here and both were bought used too. The K&N has been known to mess up fuel trims the least of the popular intakes, so if you're planning on staying with GMS1, I'd go the K&N. However I wouldn't advise staying on an untuned intake for too long.
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I have the K&N and ZZP catless myself. No problems or issues to report here and both were bought used too. The K&N has been known to mess up fuel trims the least of the popular intakes, so if you're planning on staying with GMS1, I'd go the K&N. However I wouldn't advise staying on an untuned intake for too long.
Not sure if it has one i think it does, but its not that expensive to have one welded.
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From: Halifax, NS
Member
Joined: 03-28-08
Posts: 201
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From: PA
Stock DP , with the 2nd cat bored out works best.
No need for aftermarket DP.
I've tested no cat DP , + expensive free-flowing single catted DP.
At boost, the turbo blows thru the stock 1st cat, with ease.
At low speeds, & off idle, way better throttle response with just the 1st factory cat in place.
The 1st cat enables the intake track to be fully charged, & ready, for quick throttle response, with more low end torque.
At the track, ET / MPH were a wash, between a stock DP with the 2nd cat bored out, than free flowing, & catless DPs.
You can bore out the 2nd cat, without even removing your DP.
Takes an easy 15 minutes.
You car will still pass emissions, & look stock, with no 'fitment issues, like some aftrmarket DPs.
Your stock 2nd O2 sensor will work, no codes, as the 1st cat is still in place.
No 'tuning' changes needed for this free mod.
Free mod that works better than aftermarket DPs.
Better low end torque / throttle response.
Easy, simple , free mod to try 1st.
Then , after your car is fully modded, & tuned the way you want it to be, & you still think that you need an aftermarket DP, borrow one, or buy one, do valid testing on the street / track.
Be objective, pay attention to off idle, & low speed throttle response., before an after,
& then you will realize that:
AFTERMARKET DPs ARE NOT NEEDED
My DP testing / info thread.
DP testing, the Ruthless Pursuit of Power - Chevy HHR Network
No need for aftermarket DP.
I've tested no cat DP , + expensive free-flowing single catted DP.
At boost, the turbo blows thru the stock 1st cat, with ease.
At low speeds, & off idle, way better throttle response with just the 1st factory cat in place.
The 1st cat enables the intake track to be fully charged, & ready, for quick throttle response, with more low end torque.
At the track, ET / MPH were a wash, between a stock DP with the 2nd cat bored out, than free flowing, & catless DPs.
You can bore out the 2nd cat, without even removing your DP.
Takes an easy 15 minutes.
You car will still pass emissions, & look stock, with no 'fitment issues, like some aftrmarket DPs.
Your stock 2nd O2 sensor will work, no codes, as the 1st cat is still in place.
No 'tuning' changes needed for this free mod.
Free mod that works better than aftermarket DPs.
Better low end torque / throttle response.
Easy, simple , free mod to try 1st.
Then , after your car is fully modded, & tuned the way you want it to be, & you still think that you need an aftermarket DP, borrow one, or buy one, do valid testing on the street / track.
Be objective, pay attention to off idle, & low speed throttle response., before an after,
& then you will realize that:
AFTERMARKET DPs ARE NOT NEEDED
My DP testing / info thread.
DP testing, the Ruthless Pursuit of Power - Chevy HHR Network
Senior Member
Joined: 04-18-06
Posts: 785
Likes: 0
From: NJ
Interesting....
Stock DP , with the 2nd cat bored out works best.
No need for aftermarket DP.
I've tested no cat DP , + expensive free-flowing single catted DP.
At boost, the turbo blows thru the stock 1st cat, with ease.
At low speeds, & off idle, way better throttle response with just the 1st factory cat in place.
The 1st cat enables the intake track to be fully charged, & ready, for quick throttle response, with more low end torque.
At the track, ET / MPH were a wash, between a stock DP with the 2nd cat bored out, than free flowing, & catless DPs.
You can bore out the 2nd cat, without even removing your DP.
Takes an easy 15 minutes.
You car will still pass emissions, & look stock, with no 'fitment issues, like some aftrmarket DPs.
Your stock 2nd O2 sensor will work, no codes, as the 1st cat is still in place.
No 'tuning' changes needed for this free mod.
Free mod that works better than aftermarket DPs.
Better low end torque / throttle response.
Easy, simple , free mod to try 1st.
Then , after your car is fully modded, & tuned the way you want it to be, & you still think that you need an aftermarket DP, borrow one, or buy one, do valid testing on the street / track.
Be objective, pay attention to off idle, & low speed throttle response., before an after,
& then you will realize that:
AFTERMARKET DPs ARE NOT NEEDED
My DP testing / info thread.
DP testing, the Ruthless Pursuit of Power - Chevy HHR Network
No need for aftermarket DP.
I've tested no cat DP , + expensive free-flowing single catted DP.
At boost, the turbo blows thru the stock 1st cat, with ease.
At low speeds, & off idle, way better throttle response with just the 1st factory cat in place.
The 1st cat enables the intake track to be fully charged, & ready, for quick throttle response, with more low end torque.
At the track, ET / MPH were a wash, between a stock DP with the 2nd cat bored out, than free flowing, & catless DPs.
You can bore out the 2nd cat, without even removing your DP.
Takes an easy 15 minutes.
You car will still pass emissions, & look stock, with no 'fitment issues, like some aftrmarket DPs.
Your stock 2nd O2 sensor will work, no codes, as the 1st cat is still in place.
No 'tuning' changes needed for this free mod.
Free mod that works better than aftermarket DPs.
Better low end torque / throttle response.
Easy, simple , free mod to try 1st.
Then , after your car is fully modded, & tuned the way you want it to be, & you still think that you need an aftermarket DP, borrow one, or buy one, do valid testing on the street / track.
Be objective, pay attention to off idle, & low speed throttle response., before an after,
& then you will realize that:
AFTERMARKET DPs ARE NOT NEEDED
My DP testing / info thread.
DP testing, the Ruthless Pursuit of Power - Chevy HHR Network
Just ordered the K&N intake from Amazon. I have prime so $4 next day shipping was awesome.
Cheapest I have found.
Oh and man was i not expecting the sound increase. It's incredible. No need for a BOV after getting that intake.
Cheapest I have found.
Oh and man was i not expecting the sound increase. It's incredible. No need for a BOV after getting that intake.
Last edited by umrdyldo; Jan 9, 2013 at 09:02 AM.
Stock DP , with the 2nd cat bored out works best.
No need for aftermarket DP.
I've tested no cat DP , + expensive free-flowing single catted DP.
At boost, the turbo blows thru the stock 1st cat, with ease.
At low speeds, & off idle, way better throttle response with just the 1st factory cat in place.
The 1st cat enables the intake track to be fully charged, & ready, for quick throttle response, with more low end torque.
At the track, ET / MPH were a wash, between a stock DP with the 2nd cat bored out, than free flowing, & catless DPs.
You can bore out the 2nd cat, without even removing your DP.
Takes an easy 15 minutes.
You car will still pass emissions, & look stock, with no 'fitment issues, like some aftrmarket DPs.
Your stock 2nd O2 sensor will work, no codes, as the 1st cat is still in place.
No 'tuning' changes needed for this free mod.
Free mod that works better than aftermarket DPs.
Better low end torque / throttle response.
Easy, simple , free mod to try 1st.
Then , after your car is fully modded, & tuned the way you want it to be, & you still think that you need an aftermarket DP, borrow one, or buy one, do valid testing on the street / track.
Be objective, pay attention to off idle, & low speed throttle response., before an after,
& then you will realize that:
AFTERMARKET DPs ARE NOT NEEDED
My DP testing / info thread.
DP testing, the Ruthless Pursuit of Power - Chevy HHR Network
No need for aftermarket DP.
I've tested no cat DP , + expensive free-flowing single catted DP.
At boost, the turbo blows thru the stock 1st cat, with ease.
At low speeds, & off idle, way better throttle response with just the 1st factory cat in place.
The 1st cat enables the intake track to be fully charged, & ready, for quick throttle response, with more low end torque.
At the track, ET / MPH were a wash, between a stock DP with the 2nd cat bored out, than free flowing, & catless DPs.
You can bore out the 2nd cat, without even removing your DP.
Takes an easy 15 minutes.
You car will still pass emissions, & look stock, with no 'fitment issues, like some aftrmarket DPs.
Your stock 2nd O2 sensor will work, no codes, as the 1st cat is still in place.
No 'tuning' changes needed for this free mod.
Free mod that works better than aftermarket DPs.
Better low end torque / throttle response.
Easy, simple , free mod to try 1st.
Then , after your car is fully modded, & tuned the way you want it to be, & you still think that you need an aftermarket DP, borrow one, or buy one, do valid testing on the street / track.
Be objective, pay attention to off idle, & low speed throttle response., before an after,
& then you will realize that:
AFTERMARKET DPs ARE NOT NEEDED
My DP testing / info thread.
DP testing, the Ruthless Pursuit of Power - Chevy HHR Network
Member
Joined: 03-28-08
Posts: 201
Likes: 1
From: PA
Also you keep smoother boost control....
My testing at the track didn't show any HP gain with a catless DP...
12.5s @ 110+ , all day long, with or without cats...
Last edited by 2000Firehawk; Jan 9, 2013 at 11:47 AM.