The Jardine GP1 exhaust is really loud. It does settle down after about 100kms though, and with a stock air filter/standard ecu there are a noticeable increase in torque. It only weighs a fraction of the OE exhaust. This is a great value pipe and well worth checking out. If its too loud for you, just include a baffle to calm things down.

Listen to and look at the JARDINE GP1 EXHAUST.

A great video clip of Cobra Slashcut Exhaust System on a Power Commander, Thunder Ram Air.

This is a video clip showcasing the sound of the D&D exhaust on a Honda RC51.

A video of 2006 Harley Davidson Screaming Eagle Fatboy with Rinehart Exhaust.

Installed a Two Brothers Racing Exhaust. Note to anyone interested in getting this exhaust: When you install the system you have to reverse your linkage bolt. I highly recommend a rear stand, a hydralic jack, and a buddy to help you. The instructions make it seem like removing the bolt is easy, but it's not. If you will use the jack and get the bike positioned right, the bolt will slide out and you can re-install it from the other side easily. Other than that, the installation is a breeze!

2008 Hayabusa with Yoshimura Exhaust Full exhaust, Carbon, stock air filter.