Contour Enthusiasts Group Archives Forums Branches Capitol CEG Y-pipe optimized, where???

MSDS headers- Not just for breakfast anymore!

Emissions with gutted pre-cats and an "optimized" Y-pipe will not be a problem so long as your main cat is in-tact and functional.

I would go with MSDS headers- Gutting pre-cats give the exhaust gases spewing out of your engine a lovely large chamber to expand, cool, and convect to non-laminar flow (though a certain amount occurs even with headers). You also do not get the scavenging effect of the individual header tubes. Do it once, do it right! Headers!

And with the headers, your exhaust note will increase- No need to remove the resonator (which increases rasp!)