First off, I'm a noob when talking about exhaust. All I really need to know is that increased flow out = better performance. I have a 1.4 with the MT. It is trifecta tuned. I would like to improve upon the stock exhaust, but I have no desire to make it louder, or deeper in any fashion. Any suggestions as to what exhaust system which would give me that slight performance hit I desire without changing the exhaust note significantly? Thanks in advance for any input.