pipe and silencer
#3
#5
I had a Sparks X4 complete system on my 400EX. It pulled like mad, but was too loud for my tastes. I put my stock headpipe on, after grinding the welds down, and put on a Yoshi slip on. It's a lot quieter, but doesn't pull nearly as hard, but I'm very happy with the noise/power exchange. The X4 is for sale.
#6
I'm Guardog's buddy and I have to agree with him that the Duncan Fat Boy 4 fipe and silencer are awesome. I put on a K&N air filter and new jetting. I also put on the white brothers Rev Kit. It was an incredible increase in power. I am going with the Qwiksilver Carb. Everything that I have read is good. I think that you cannot go wrong. Good Luck. Let me know if you need any help.
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