Was very happy with spending the money for the full exhaust system. I gained alot of power in the lower end of the spectrum which is useful, especially from a standing start. It's hard to say how much I gained from it, simply because I haven't really pushed it in the higher gears. However, dropping it into 3 @ 100kph, theres' still alot of pull which makes overtaking alot easier to do as well. from ~60 - ~100kph in 2nd gear, the engine + exhaust sings a really nice tune and you can really feel the pull. In addition to the power gain, I gained fuel efficiency as well. I was getting around 14-15L/100 prior to the install, and since I've got the work done, my average has been 12.71L/100 over ~8200km. Well worth it, but expect to pay a penny or two!