Exhaust

Pretty much all the aftermarket pipes are loud.

Need to know what mods your motor has and what style of riding do you do to know what pipe to suggest.

So besided loud, are you looking for more low-end or top-end power?
 
True, FMF is a decent low-end pipe that will work fine for a stock to mildly modded engine. I have an FMF and it's plenty loud with the PowerCore2 silencer.

There's a thread someone put together recently that has video clips of all the available aftermarket pipes. Might try doing a search for this post so you can get a first-hand sample of the sound of each pipe.

Good luck!