Besides the addition of the 2 pullies and changing the plugs, i put a test pipe on. all i can say is WOW . Barney feels much stronger at the bottom end, throttle response is sharper than ever (i didnt think it could get any better than it already was). Now when i clutch in to shift, the rpm drops faster (probably the pullies?), and when i blip to downshift, the revs come back up faster. As for the test pipe, its only a tad bit louder under 3.5k but anything over and you can tell its a bit louder (under normal driving conditions). WOT is another story.