It wasnt THAT expensive and after a couple hundred miles it sounds great.... felt like a boost in performance when i first added it too. Now i cant remember what it used to feel like so i can no longer compare. If you want a loud in your face exhaust, this isnt it though, because it is kinda loud, but by no means in your face or booming.
i have a flow 40 delta series. 3" at the y-pipe to the exit. it sounds NICE. if you can tolerate some interior resonance flowmaster is the way to go. granted being in Turkey the labor was dirt cheap (100 bucks for pipe and labor) but 90 bucks for the muffler AND shipping. 190 bucks total for me and i LOVE the sound. on a warm/hot start it has a nice grumble to it. cold starts has the cold idle but everyone gives me approving looks. the 3" adds a nice "big engine" note to it when you slam the skinny pedal.