KN black and Borla ATAK CAT

[securityguy]

The Corsa is very loud on start-up to. I think they all are regardless of what you buy. They do calm down quickly...in like 30 seconds or so.

 

[AXE]

You might want to look at the Magnaflow from Hottexhaust.com. It is a little louder than stock on startup, but a nice growl when running through the gears in acceleration.

Easy install and the price is very reasonable at $700ish.

I got a detailed post on mine with pictures and sound.