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Old 02-17-2019, 09:14 PM   #3
Mike Meier
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Join Date: Dec 2001
Location: Webster, TX
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Default Re: Chevy Cobalt DF/S and maybe keep it streetable

Quote:
Originally Posted by Mark Yacavone View Post
Sounds like you'll get there, Mike
Not sure what converter that takes but if you find out.let me know. You should able to come up with something looser but retain the lock -up.
Be careful on the cam .You don't want to kill much torque but bump the lift up . Street and strip pattern with about 220 duration lobes. Talk to Chris Padgitt at Bullet.
I wouldn't use a cut out, per se. Make the header extension pipe end with a flange , where you can bolt the street exhaust back on , or be able to play with collector extensions that I imagine would be fairly long.
Good luck
I think I will wait on the cam because I want to avoid opening up the engine as long as possible.

Regarding the headers, here are my options:

1.5" versus 1.75" primaries;

2.5" versus 3" exit for down-pipe

Short, mid-length, or long tube primaries (caveat is that the long tube header is only 1.75" primaries).

The other challenge is keeping it streetable by keeping the catalytic converter. I wonder if I could have the exhaust shop relocate the cat further back in the system, like just in front of the muffler that way I can still have a longer, unobstructed down-pipe; and just unbolt the cat / muffler section from a flange.

Thoughts?
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Mike Meier
"World's most expensive DF/S" 2007 Chevy Cobalt....because suffering through owning an AMC Stocker wasn't enough
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