i drive a 94 ls, and im having a gsr head put on this weekend. following this, i plan to buy a catback exhaust. im having some difficulty deciding, though. im told about comptech, apexi n1 and 5zigen fireball, but im particularly interested in the greddy evo. if anyone can give me any suggestions, itd be appreciated.

 

i suggest you eat my ****...oh...thats not one of the choices...just kiddin with ya schneller...get an exhaust tip from pep boys like andrew has...those ALWAYS add horsepower...glad i could help

 

Time to figure out where you want your powerband, and how much HP you plan to make when you are all set and done.

The comptech is only 2.25" OD, so it will become a bottleneck if you plan to go more than 180whp
The other two are 60mm, which should be good till 200 - 210whp

If you plan on making more, go at LEAST 2.5"