Chevy Cobalt DF/S and maybe keep it streetable

[MikeMoller]

Originally Posted by Mike Meier

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?

im guessing, but I would certainly lean towards the 1.5 / 2.5 combo. For lower hp cars, smaller is almost always better. You may also want to invest in some type of fuel pressure regulater that will allow you to adjust fuel pressure to the injectors.