I tried this on the exhaust board but no one seems to know... just wanna know if it will fit on my engine. Here's the msg.

I am looking for a header setup that will support a 3" pipe to the muffler... then split's into 2.5 in the catback. Will this model (#6872*) work on my L03 TBI engine?? They have a model listed that will fit no question, but it's only 2.25 like stock. The model I listed is labeled for this car... IROC, Z-28, Formula 86-90 5.0/5.7L T.P.I. , 3" inlet slip-on single cat. Anyone know if this will work on my L03?? Thanks,
Jay

 

Any of the header/exhaust systems for any V8 in one of these cars will fit your car and engine.

You're doing the right thing by not looking at the L03 one, precisely because of the drinking-straw Y-pipe. But if you buy the entire system (headers, cat, & cat-back) for a 350 TPI car, it will all bolt right on, fit to your heads and everything, and work a whole lot better than the L03-specific setup would.