I have my eye on the Borla Cat-Back Exhaust System for the non turbo being sold at dynamicracing.com. It doesn't give a whole lot of information about the system. What elements of Daveblack's suggested N/A staged upgrades does it contain? Does anyone have this, and if so, are they pleased with the result?? $850 is a lot to spend, and I want to make the right decision.