My '92 Si has a DC header, 4-2-1 1piece. The stock cat wont bolt onto it.

What aftermarket cat will?

 

let me guess the flange on the header id stright across ans the on the cat is at a angle.I had the same problem i just took it to a exhaust shop and the cut the header flange and reweled for me fits perfect now

 

no, the hole on the cat is to small. wont fit over the header...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sik94hatch &raquo;</TD></TR><TR><TD CLASS="quote">no, the hole on the cat is to small. wont fit over the header...</TD></TR></TABLE>

I've never seen a slip-fit cat before...

just take it to an exhaust shop. They'll make quick work of it.

 

Slip fit? Shouldn't there be a gasket in there somewhere? Sounds like an ebay special.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jakester9500 &raquo;</TD></TR><TR><TD CLASS="quote">Slip fit? Shouldn't there be a gasket in there somewhere? Sounds like an ebay special.</TD></TR></TABLE>

I was being sarcastic about the slip fit, but I'm pretty sure he was serious. But yeah, it either needs to be welded to the header, or weld a flange to the cat that matches the header, and use a gasket. Either way there is welding required, which is why I recommended an exhaust shop.

 

take it to a muffler shop and have them flange it. make sure they dont weld it all together