I know hks is good but what else is their?

 

HKS is the BEST, imo. It sounds the least ricery. My sound, with a cai and crawford cats, and hks hipower, is very deep and throaty. But, what are u looking for? Deep and throatry, or higher pitched? Greddy is good for that, as is Amuse(expensive). Whats ur budget? hks isnt cheap

 

Pretty sure for SC you won't necessarily want anything bigger than 2.5" in diameter. With a high boost turbo application, you might actually need >2.5"

others know a lot more about this than I do.

 

I was thinking about getting a used one. Is their any difference
In a exhaust ment for a turbo or s/c than an exhaust meant for a n/a

 

.. i dont think theres such a thing. could be wrong.. but... yeah

 

Basically with NA, and very low boost FI applications, if you have exhaust piping that is too wide, you'll lose backpressure.

With a high boost turbo, on other hand, you might need larger piping to get the safest/most powerful setup

 

hks and amuse are not the best choice for a turboed car

 

so if I have a supercharger it doesn't matter about the pipe diameter

 

not really.. no