Corsa is my personal preference and one of our top exhausts sold, it would be the top selling if it weren't for the price point.
My personal rank is in order below:
1. Corsa Extreme - deep, throaty idle and low sound through lower RPM band, minimal to zero drone
2. AWE Tuning 1FG/0FG - high end tuned V6 sound with a little low end grunt, minimal to zero drone
3. Borla ATAK WITH Borla Renator - similar to Corsa Xtreme but not as throaty and more expensive
4. Corsa Sport - deeper than stock, but not as deep as Extreme, zero drone
5. AWE 2FG - best budget option, tuned V6 sound but not too loud, has a tendency to rasp, needs over 1k miles to break-in
6. Borla S-Type - deeper than stock, but raspy and some drone
7. Borla ATAK - very loud, raspy, has drone - If you want LOUD, this is it
Hope this helps your decision. We carry all of them and have literally ALL of them in stock including the mid-pipe of full tail-pipe kits...with the exception of Corsa full cat-back kits with tailpipes but we've got those coming in next week.
Feel free to send me a message if we can help with any of the above options.
Additionally, we have a 15% off sale going on right now for MBRP exhausts that ends tomorrow at midnight. PM me for the discount on those, good for all makes and models as well.