Im trying to decide to get either the Greddy Sp or the HKS Hi-Power exhaust for my 1990 twin turbo. Which one sounds the best with test pipes in place? Which one does everyone think looks the best? Which one should make the most power?

 

IMO,....I'm more partial to the Labree system sold by Specialty Z.

 

hmmm... another exhaust question.
Might i refer you, young lad, to my Link Page.
Check out boost solutions.com, they have sound clips with the various exhausts they sell.
If I were you, I'd be more concerned with what I like as opposed to what others like. Just a thought.

 

boost solutions is down!!! no sound clips!!!! :doh:

 

If u suck up enough to John or Russel at Z1, you may get them to put a ohonw up to the exhaust pipes of a TTZ equiped with either exhaust. I know john's TT has the Greddy pipes. And if Greg is hangin around, his TT has the HKS Hypers. I have the HKS pipes on my NA and I love them. They look more unique with the upswept design..gives the car a real JDM look. HKS has picks if their exhausts, and a few sound bites to hear. Give that a shot, www.hksusa.com.
Good Luck!

 

sorry bout that..my hands moved faster than my head. If you have them put the phone up to the exhausts

 

has anyone had any experience with the specialty Z split down pipes with the waste gate seperator. Good? Bad? No difference?

 

Yep...I have 'em, along with the test pipes with hi-flow cats. I have some pictures of them around here somewhere.
https://www.zdriver.com/showthread.php?t=10596
It adds a nice deep growl to the exhaust. Noticeable power difference. I haven't been able to drive it much since I added them. It was about two weeks, then I tore it all apart. Well worth it, IMO.