Sparks pipes are awesome and are supposed to be one of the best, if not the best. They are loud, but not as loud as some other pipes out there. They are above legal limit, and do not come with a quiet core option.
If you want more low-end power it is recommended to go with an X-4 pipe.
Neal C. Tody - ntadej@hotmail.com
-2005 SE Yamaha YFZ450 - Pro Design Pro-Flow Intake, Renthal YFZ Bend Handlebars, AC Bumper, AC Nerfs, Holeshot MX 20" fronts and 18" rears, +2 Burgard Standard A-arms, +4 G-Force Axle, front shocks with the DeRisi Racing Pro Millenium Kit valved for MX (Would never recommend to anyone).
-2000 Banshee - Found. Damn meth heads even destroyed my brand new engine. They've still got my HiPers too, SOB.