What is the most popular?

Does anyone have magnaflow?

 

Axleback won't do much for you, but i liked the apexi one when I heard it.

Try to go for a single 3'' with a Y pipe if you like 2 tips... if you like single tip get one of those. You can also get a a dual 2.15'' or greater w/ an X pipe, H pipe which would give nice sound and power.
Are you looking for a certain kind of sound? Loudness...? Obnoxious? :-D

 

GReddy SP2 for around $500 shipped.

 

I am looking for a clean performance purr at highway speed.

 

Welcome.

For exhaust recommendations please see the exhaust forum. Plenty of suggestions, photos and sound clips.

 

Get a nismo exhaust then. It fits the ideal for 85% of everyone.

 

There is no reason why there should be yet ANOTHER "what is the best exhaust thread" on this forum, and there is no "best exhaust"

Please do some independent research by reading old threads in the Intake Exhaust forum.