Speed Engineering Headers - Adding cats
 

Has anyone tried adding a high flow cat to a set of Speed Engineering long tube headers and y-pipe? For $400 headers and y-pipe and a $100 for a cat, I'm willing to do some hacking on these things to make it work but didn't want to reinvent the wheel if I didn't have to.

I put a single high flow cat after the y pipe on mine. No issues. I clamped it to the y pipe and the muffler shop welded the other side of the cat to the pipe.

just a magnaflow high flow cat 3" in/outlet

If you're doing a single do a 3.5"

The speed engineering Y pipe is 3" off the headers and 3.5" after the merge

Be prepared to have flanges welded in or at least weld the short section of the Y pipe that slips together and then do the aluminum foil wrap with the 3" band clamps or you're gonna have a lot of leaks. That's my only issue with the headers.

Oreilly sells the 3" clamps. They are in a flat package and they do not have a step in them like some band clamps do. Those worked best and my buddy that's ran a muffler shop for 20 years said he's had the best luck with those, so far they are working better for me than the others i've tried.