I've done a few searches, but haven't had much luck.

I'm interested in what kind of hp gains do the HKS and Greddy catbacks have? Have there been any dyno's floating around?

I hear a lot of good things about greddy.

I have a greddy, and I don't really think I felt all that much of a gain. I heard it helps w/ the headers, but I am currently without, so I don't know firsthand. However I think I remember hearing something in the range of 5-7..like I said nothing major to write home about for such an expensive mod... Its saving grace is the kickass sound.

Ju§tin

2-5 HP over stock. if you have cams or boost, you will gain some good HP.

i chose the greddy cat, because i heard it had the least back presure and also has an deep tone to it. i think i gave me a couple of pony's but i'm also running an hotshot header with it. if you go to se-r.net and look up the old sport compact car, project car 200sx se-r they talk about the exhaust set up.

the stock 200sx se-r exhaust system is actually a pretty decent system. like said above- 2-5 hp is the usual power gains, except if you have cams, turbo, ect..

anybody ever had the pacesetter cat back? there arent any sensors after the cat right? im planning to put that with and apexi N1 muffler on the end.

After I installed my Greedy SP on my car, it felt like I lost a ton of low end power. Not sure if I gained anything up high though. I was really dissapointed in the power department but it sure sounds nice. I think it is by far the best note you can hear from a 4 cyl

When I put my greddy exhaust on, I didnt feel any difference for about a week. Then i unplugged my battery over night to reset the ecu, to see if this would help, and sure enough it did.
It opened up a lot at hi-rpm, and i definetely gained some low end power. I wanted to get a 2.5" exhaust, but i settled for this one since Ben (bennitomalit0) had it.

Its amazing how small the gains are for a mod that is so expensive. I've seen aftermarket pulleys push out more HPs then an exhaust.

thanks DaGenesis, i got the greddy to, and i didnt notice a difference, and i was like shouldnt i feel somthing?????, so i unpluged my battery and sure enough i noticed a diff, not a shit load, but deffinatley a diff, thanks alott . mann , i wouldnt know what to do without you guys

my friends 4 pulley set gave twice the amount of gains for half the price of an exhaust system. stick w/ the stock exhaust, or if you want the sound just get a universal stainless muffler, or if you want the small gains from an exhaust go to a auto shop and get them to custom bend you a 2"-2 1/4" pipe from the cat back w/ a universal muffler. same gains and half the price. my custom cat back gave me 4 whp, for $250.

Originally posted by hyperwhite200
thanks DaGenesis, i got the greddy to, and i didnt notice a difference, and i was like shouldnt i feel somthing?????, so i unpluged my battery and sure enough i noticed a diff, not a shit load, but deffinatley a diff, thanks alott . mann , i wouldnt know what to do without you guys

hey no problem,
I felt more of a difference probly because of my S4's :D

I felt a huge gain from my exhaust. Reason being, I waited until I had every other bolt on before I got it.