Zoomie

it's loud, and annoying on long trips with the roof up.

awesome with the top down, awesome in tunnels.

i wouldn't count on it to make power. on my back to back dyno's it lost power (at a high elevation), but with a HFC and back to near SL i would think it is helping a bit.

it is dramatically lighter than stock and being in segments makes it a lot easier to remove parts to get to stuff under the car.

03BlkS2k

there's a thread on here with it making more HP than an invidia (back to back dyno i believe). I also believe i've read somewhere the dual one decreases power.