The huge amount of information makes this tough for me to search.

I'm going to be running SLP 1 3/4 headers into dual cats....and out through a hooker catback. I'm looking to run Catco cats. What part # do I need? What diameter is the dual cat Y-pipe from SLP? What is the diameter of the Hooker intermediate? 3"?

If it matters, I'm NOT running A.I.R.

Sorry, but there are so many catco cats, and I'm not sure about the y-pipe diameters, so it was hard to come up with the answer.

 

SLP makes the system so that it fits directly to a factory system. So, getting direct-fit factory replacement cats would allow them to mate with the SLP parts, one would think.

http://store.summitracing.com/partde...art=CTO%2D4153 shows the Catco direct fit system. It includes the downpipes, which you won't need - the only question is if their downpipes are routed exactly like the factory, or if they took "liberties" which would prevent them from mating to the SLP downpipes. You'll probably have to contact Catco to find out and hope the tech person that responds has a clue.

The Hooker system (16823) is not made for dual-cats. Is that what you meant by "Hooker intermediate"?