I currently have the greddy sp on my FD and i want to change it to either the apexi gt spec or the hks carbon fiber ti exhaust. I need everyones opinion on which one would be better.

 

The Apex'i GT spec is LOUD as all hell and doesn't sound very good. Never heard the HKS.

 

I think you'll be disappointed with either of those over the GReddy SP.

 

Why is it that you want to go to one of these exhausts instead of what you have now. Kyle is right the gt spec is very loud. I have it on my car and it screams. I personally don't mind the sound, but it's too ricey for some.
-Nic