Loudest is HMF. The best is Yoshimura. Louder 99% of the time does not mean better performance and gives our hobby a really bad name. Power Commander 3 or 5 is the best you can get. Pricey, but you gotta pay to play.
2008 Honda 700xx Red/Black, Full Alba Exhaust, UNI Filter, EHS Lid, PC3, 13T Front,Pro Armor Pro XC Bumper (BIGGEST P.O.S EVER MADE), Pro Armor Full Chassis/Swing Arm Skids, PRM A-Arm Skids, Maxxis RAZR fronts and rears. In the works, ported/polished head, custom cam, ported T/B.
1997 Toyota Supra Black/Black with a little boost and 1300 hp
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2003 Mustang Cobra ditched the S/C for a 80mm hairdryer
2007 Yamaha R1 Charcoal/Black
2013 BMW 335 Coupe Deep Sea Blue/Black