this weekend I’m going to tear into my 92. Right now I have hooker 2055’s on it, with a 3” flowmaster catback with no cat on it, and it honestly sounds fantastic, it’s not really loud, isn’t raspy, no drone, it sounds great. With that being said I am going to tear it all out and start over. I have a set of NOS SLP header’s, with the y pipe, and a NOS SLP TOTL cat back. My car is a 92 a 92 Z28 1LE. It was an N10 dual cat car by the RPO, but the hookers were on it when I bought it years ago. I had an 88 iroc that had a ZZ4 with the same headers, and catback, and it did have a cat, and it sounded great as well. What I’m wondering is if I do those headers and catback without a cat will it be obnoxious? Anybody have a similar setup? I bought the catback cheap and technically it’s the wrong midpipe, as it has the 4 bolt rectangle flange for the cat so I’ll be cutting that off regardless of whether I go cat or no. Just looking for options and opinions on the cat or no cat.

 

My setup exhaust-wise is similar and I run without a cat. I originally had the TOTL SLP mufler and it sounded great. I changed the muffler out to a similar Flowmaster and it sounded just as good just louder. I recently changed to a Magnaflow to return to the duals look and the sound is a bit quieter, but still good. If you can get past inspections without it then go without the cat.

 

Ive never run the SLP exhaust system but ive run about every other one at some time or another and have taken the cat off all 5 Thirdgens ive owned. They never were too loud I didn't think and never had a strong gassy smell people say these cars get when you remove them. I did take my charcoal box out of my 87 Formula and didn't vent it good enough. It got to smelling strong so I wound up replacing it and it went back to normal

 

Dude, ABSOLUTELY remove the cat lol. This is mine, the day after I removed the cat