Even though it's not on the list, I have to say Trust Ti-R

 

greddy ti-c alot quiet
http://www.youtube.com/watch?v=y0b4EyLfkJU

 

I have the T1R 70mm v3 single and it is awesome. But you need to have a test pipe in order for the exhaust to sound good and do not use the silencer. It is basically a straight pipe with no packing so its very good for performance.

 

HKS 75mm single >>> both t1r and greddy all day errryyyday...

 

for T1R... my friends old Greddy exhaust rusted before off an older car