If you do a slip on you should also do a programmer. They run very lean stock and a pipe would bring it dangerously close to the ragged edge of lean.
bkabner I have to disagree with you. A slip on is the majority of gain you get from an exhaust. A head pipe does make a difference, but not much that you would notice and it's usually in the 1 hp range. The stock head pipe on the 700xx is more than adequate for what we ask of the engine. Now if you do an over bore and cam then yes you need a better head pipe. I installed a Yoshimura RS3 slip on on my xx and the difference was like night and day. But I am using a PCIII and not an HMF programmer. I'll be going to the dyno in a few weeks to see the after "the big 3" hp and tq.
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
Last edited by THREESVTS; 03-26-2009 at 06:58 AM.