Any Gains from Just a Downpipe? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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View Poll Results: What to do...?
Get downpipe 3 18.75%
Get tune 9 56.25%
Do something different for the same $$$ 4 25.00%
Voters: 16. You may not vote on this poll

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post #1 of 17 (permalink) Old 06-26-2010, 01:09 PM Thread Starter
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Any Gains from Just a Downpipe?

I know there are gains to be had in the DP, but I'm too chickenshit to do a header swap at 25k miles, but I was curious if I'd see any gains by just swapping the downpipe or should I get a tune instead?

I know the header is restrictive too, but I don't think I'm at that point yet....arg, choices choices...

Not as worried about warranty as I am my ability to get to the header. It'd be more than a 1 day thing, and I just don't have the means at the moment.

Thanks for any input....maybe some appearance things ~$250?

or just save...I guess I could save it toward something bigger...hmmm....


Last edited by stickx911; 06-26-2010 at 01:39 PM.
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post #2 of 17 (permalink) Old 06-26-2010, 01:20 PM
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Just the DP? Same exhaust system? If you haven't upgraded your exhaust system spend your money there.

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post #3 of 17 (permalink) Old 06-26-2010, 01:34 PM Thread Starter
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Quote:
Originally Posted by Red07SSNA View Post
Just the DP? Same exhaust system? If you haven't upgraded your exhaust system spend your money there.
I have done my cat-back, just haven't started working my way up yet.

It's just a tsudo, but it's a 2.25 or a 2.5, so I figure that's plenty for me (unless I ever go FI years down the road that is)

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post #4 of 17 (permalink) Old 06-26-2010, 02:37 PM
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i voted get downpipe.

simply put, the smallest area on the stock 2.2 exhaust system is located in the downpipe.

after the dp, u'll be like me and want a shorty header next.

running 2.2 w/ 2.4 mani, injen CAI, CA Downpipe, Tsudo Exhaust, tuned.....wishing i had a nice header w/ 1.5" primaries.

then again i may say **** the header and go turbo.
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post #5 of 17 (permalink) Old 06-26-2010, 05:05 PM
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Quote:
Originally Posted by warrenb213 View Post
i voted get downpipe.

simply put, the smallest area on the stock 2.2 exhaust system is located in the downpipe.

after the dp, u'll be like me and want a shorty header next.

running 2.2 w/ 2.4 mani, injen CAI, CA Downpipe, Tsudo Exhaust, tuned.....wishing i had a nice header w/ 1.5" primaries.

then again i may say **** the header and go turbo.
Is the power gain from all your mods really noticable? just wondering.
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post #6 of 17 (permalink) Old 06-26-2010, 05:13 PM Thread Starter
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Quote:
Originally Posted by DROPPEDATBIRTH View Post
Is the power gain from all your mods really noticable? just wondering.
top end of my SRI, yes. and word is the 2.4 intake mani is supposed to be substantial. Now for the cat-back. without a header or a downpipe, there wont be any gains.

But I always thought to do both at the same time or not at all...so I'm more curious as to where the larger bottleneck is.

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post #7 of 17 (permalink) Old 06-26-2010, 07:16 PM
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The bottleneck is the downpipe especially for the 2.2 engine. If you have the catback already,then a downpipe with a high flow cat will benefit the exhaust system that you have installed. Your next step should be a better exhaust manifold, either a header or the GMPP extrude honed exhaust manifold. You will gain at least 5hp and 6 ft/ib with this LSJ ported exhaust manifold and it will not crack or rust. I run it on my car and am quite happy with it.
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post #8 of 17 (permalink) Old 06-26-2010, 07:48 PM
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Has anyone ever ran this? Does the 2.4 header and downpipe even fit a 2.2?

06-08 Chevy Cobalt SS 2.4L Ecotec OBX Header Exhaust: eBay Motors (item 150459613318 end time Jun-30-10 09:36:12 PDT)

They also make a header for our too, but it would be nice to get it all in one.
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post #9 of 17 (permalink) Old 06-26-2010, 10:56 PM
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Quote:
Originally Posted by DROPPEDATBIRTH View Post
Is the power gain from all your mods really noticable? just wondering.
welllll i run 15.6 without NLS'ing, a terrible 60ft, wheel hop as soon as it breaks loose no matter what, and all my carpc/stereo equipment haha.

so yes it's made a diff.
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post #10 of 17 (permalink) Old 06-27-2010, 03:01 AM Thread Starter
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Quote:
Originally Posted by dandaman15 View Post
Has anyone ever ran this? Does the 2.4 header and downpipe even fit a 2.2?

06-08 Chevy Cobalt SS 2.4L Ecotec OBX Header Exhaust: eBay Motors (item 150459613318 end time Jun-30-10 09:36:12 PDT)

They also make a header for our too, but it would be nice to get it all in one.
cat-less

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