What are the options for a 4" cat back system? I see some custom made stuff which looks great, but do any of the big companies make one? Better who makes them period!

 

honestly take the car to a reputable exhaust shop and have them make you a custom set up you will be surprised how cheap it is over buying and installing a brand name one. a lot of old school muffler shops are incredibly talented and knowledgeable and often performs better than a store bought one.

 

HKS made a unit. They are hard to find...

 

Good info, I just may do that! Anybody else?

 

A-spec makes one, Apexi GT Spec is like 3.94"...those are some of the only ones i can think of...

 

Greddy Power Extreme, but it is no longer made. I still have mine laying around, it is one of the best sounding exhaust I've heard, deep guttural sound.

 

I have a greedy power extreme. It's 3" inlet then goes to 3.75

 

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/review-specs-4-inch-turboback-magnaflow-exhaust-676685/