Spoke w/ FMF today, Powercore 4 Q pipe suppose to be released in 3 weeks for WR250F. Though no official stats yet, they are claiming quiter or as quiet as stock w/ better performance. We shall see.....
my dad has been trying to get one for his bike for over 3 months now but FMF keeps saying 2 more weeks everytime he calls. His bike is an 2000 XR650R. He just ordered the powercore 4 with the Q tip and is going to try that. It is the same tip as they use in the Q pipe but with out an extra baffle inside. He is suppose to pick it up tonight and we are going out this weekend. My friend with a WR400 also bought the Q tip, he already has the powercore 4 on his bike now so i will report on that bike also.
I think it's about time the aftermarket started to reverse this trend of ever-louder exhausts for four-strokes. If the performance is at least on par with stock, or maybe a little better, I hope they sell a ton of them.
several companies have them now. My dad has been looking for a year now but they are all in the making for his bike atleast. supertrapp has the ids2 (internal dics system), big gun has a quiet core, fmf, and a few others that i can't think of right now. With these 4-stroke mx'ers they are the loudest things you can imagine. But its all coming around.
I'm curious whether, like the power-core, the disks are internal and easily accessible to change. Three in my group (XR4s &XR650R) just bought the White Bros. E-Pipe and it's reasonably quiet with 12 discs and can be muted further by removing discs.
I have an old FMF megaphone with Supertrapp arrestor, which I'd like to make even more quiet. Anyone try the FMF PowerBomb (header pipe) with that weird, purported "sound deadening" bulge?
my dad was looking at the powerbomb but of course its not out for his bike yet. It seems all the powerbomb is a resonator. FMF claims to have better air flow or something. Not sure how much of a difference it is over the hi-flo headers they make. I am also kinda of curious to see the difference.
I did read something that FMF said about the "bulge" was invented to help keep things quiet, but I think it ended up making more/better power. I personally question how much it deadens the sound as the FMF pipes are among the loudest of all the 250F pipes. They are extremely loud, but the SX pipe performs pretty well.
Interesting to hear others complain about FMF delivery. A friend of mine had a pipe for his XR400 on order from FMF for months, even had money down at the dealer and he finally cancelled the order after getting another promise it was going to be here in "a couple more weeks".
BUT if they do produce something quieter I'd order one. I had a Yoshi Ti pipe for my DRZ400 but went back to the stocker because it was too loud to responsible ride in the woods up here in OR. Heck I'd even consider putting one on my YZF which only sees the mx track.
OK. So they're saying that if it gives any advantage over stock, it will be a small one.
What is the purpose of this pipe then? Sure its quiet, but is it worth spending that much money on something that barely beats stock performance? If it were my choice, I'd just stick with the stock pipe and save myself the money.
I run the MegaMaxII on mine. Its quiet enough for trail riding, and has a decent power gain as well. So far, I am happy. The quality could be a bit better though. My silencer is starting to separate from the fitting that attaches it to the header, and of course, it cannot be welded. :(
Well my new FMF came in (Annerversary gift from wife, yes I worked it right:) ) and I installed it and took a short spin up and down the street in front of my house. I will give a woods report when I get it out there. Here's my review:
Fit and finish: Excellent. Mounted wonderfully to stroker header and 3 frame bolts. The strap mount (rear most mount) was a little tricky and needs to be mounted first. The only negative is it is Looooong! 18 inch can that sticks out 5-1/2 inches farther than stock. I have a MX rear fender and the end of the muffler is almost even with the end of the fender! For those that don't have mx fenders the stock exhaust ends at the end of the frame rails, so add 5-1/2" from there to imagine where it ends. All in all though it does look cooler than the stocker
Sound: I could not tell the difference from my stock exhaust (without butt plug) and stroker turn down end cap. Idle was very quiet. When the revs got up it got louder but again I could not tell any difference from my stock setup it might have actually been quieter. What I did notice was the tone was much sweeter, a kind of more throaty deeper tone than my stock setup.
Weight: from my pretty acurate bathroom scale I detected a 2 lb. savings in weight.
Performance: I have the stroker header and 33 mikuni (was on bike when I got it). With my limited street test I did notice some more low end, seemed to pull a little qicker. This will be further analyzed in the trails.
Overall: I am very happy, the only negatives are the length and a note in the instructions that said repacking would be needed in the lower chamber after 30 hours (seemed too soon to me and I thought it would be maintenance free, silly me).
By the way FMF said the dB was between 92 and 94 for the KLX when I asked.
As a gift, it's a great bargain :) BTW the wife got it from HiperSportd for $259
If you want to make good power you'll find that quiet exhaust canisters mean BIG volume canisters. So you'll see more long, or big diameter canisters in the future. Hopefully this pipe is a step in that direction.
Looking forward to hearing your thoughts after some woods time on the pipe. Thanks for sharing the info.