by JohnSBA » Mon Jul 13, 2009 12:43 am
I went with FMF powercore 4 with spark arrestor and am very happy with it. Along with small jetting changes (98 pilot jet and opened airbox) the bike runs *SO* much better than in stock form; it starts first kick no choke, idles perfectly, and revs up/down smoothly. At under $200, you can't beat it.
2018 Yamaha YZF-R1
2017 Ducati Multistrada 1200s
2006 Honda CRF 250x (stolen)