header fitment??
 

has anybody ever matched up a 2.5' collector with a 2 1/4" or 3" to 2 3/4, etc.???

I bought a header with a 2.5" collector.. i just realized my cat was 2 1/4.. before I go and put it on I want to know what im getting myself into. A few guys have told me I need to weld on a flex joint or get a bottle neck welded on or something (which I dont wana do) I figured I would just drill out the holes a bit bigger so that the bolts line up and just toss in some gasket maker and call it a night.

Anybody have any experience?

yeah do that chris, it should be fine. it would probably work better though if you brought me back my damn wrenches you fool!

pm your address.. im going to send them in the mail. I haven't driven my car all summer because its running like crap. I'll just mail it to you aaron lol

I have the opposite going on. My exhaust piping is 2.5", as well as my cat. When the cat meets the header, they made a flexpipe to adapt to the stock header size.