They sound like the 2 youtube links usually.
Well unless you want to sound bad boy racer, i'd go for Res, quiet hum on idle and opens up on throttle, non res bumbles of idle and gets too Baked bean can. On a V6 yeah, doesnt matter as they sound awesome but 1.8t...Ive got the miltek res btw. Not heard jetex/powerflow
i wouldnt go with powerflow systems mate, only thing u'll gain is a stainless steel system over the standard.If you havent got the money to spend now then just save for abit longer and get a good system.