Sparks

[jdonahue400ex]

I have a white brothers r4 slip on pipe on my 400ex right now and I was wondering if it would be worth it the buy a Sparks X-6 full exhaust for it? How much much bigger of a power gain will it give?

[400-416EX]

I asked the same question the other day scroll down and look for the same post

[400-416EX]

http://www.exriders.com/vbb/showthread.php?s=&threadid=120762

[400ex men]

i lot i think is it a slip on?