I've done this. Works just fine with my FMF pipe. I have both a stock silencer and a PC304 silencer, and I can switch between the two silencers in a matter of minutes.Chris in Denver said:I am curious to hear from someone who has actually done this. I can't see why it would not work. I just want to know the net quiet achieved. I just bought a kdx with a waaaaay to loud pipe. I want good pep but not obnoxious.
blackduc98 said:I've done this. Works just fine with my FMF pipe. I have both a stock silencer and a PC304 silencer, and I can switch between the two silencers in a matter of minutes.
Stock jetting is really rich, so it is not surprising that even with mods you'll end up leaner than stock.supajdogg said:Does the stock silencer make a difference in jetting? People have suggested I go with leaner than stock jets with a FMF pipe and Boyesen power reeds. They suggested 152 main and 46 pilot, FMF says 155 main, 48 pilot, and stock is 160 and 48. This seems REALLY WIERD that a new pipe, reeds, and losing the airbox lid makes me need to lean out the jetting.
My bike already came with an FMF pipe and PC304 silencer, so I had the opposite task of acquiring and fitting a stock silencer (I wanted the bike to be stealthy). I had to cut about 5mm off the end of the silencer tube which mates to the expansion chamber, and I also had to bend same tube a little to make the silencer mounting holes line up with the frame. But then again, my FMF pipe was pre-dinged and maybe pre-bent by the previous owner. The bottom line is: you can make it fit.just_a_rider said:How did the FMF pipe hook up? Did you have to do any pulling or bending to get it hook up in the right places?
Hmm, my expansion chamber rings pretty loud when I get on the gas hard. But when I let my son tool around on my bike a little, I was amazed how quiet it sounded from just a few yards away. So maybe the perception of noise depends a lot on where the observer is. But I will definitely say that the stock silencer takes away a lot of the high frequency sharp barking, compared to a PC304.supajdogg said:The expansion chamber makes most of the power boost. The chamber makes the power, the silencer makes the noise.
for you guys that have an aftermarket pipe with stock silencer, was it worth the $200 pop for the expansion chamber?
And, is it as quiet as the stock pipe/silencer combo?