i have a q4...it's not very loud at idle...sounds quieter than my lawn mower when the bike is warming up or when i'm stopped...i'll try to feather the throttle as i leave home...i let it rip when i'm on the main street and it's loud enough..people don't realize when i'm idle at intersections..so...it startles them sometimes when the light turns green...

 

TNC, when I was talking with Dave Turner at Muzzy, he indicated that the can may not have changed, but their quiet baffle was an option on the first system and now it comes with the quiet baffle. In fact, here's what he wrote me: "The one you see on the picture is correct. When you purchase the system it comes with a Forestry approved spark arrester and quiet baffle insert. You can be loud or be quieter. When we first sold the systems the quiet baffle was an option. Now it comes with the new system. So maybe your friend got one with out and one with the quiet baffle."

 

Another reason to add the slip-on is the performance gain that comes with about half an hours work, on my buke that was the single biggest performance boost. I jetted for it about a week later but the pipe along was a bigger boost the the Uni filter and the jetting. My powercore 4 instructions said no jetting required if that was your only change from stock and I think it would have ran like that just fine but it was happier with a performance A/C and a dynojet kit.

 

Yeah, that sounds about right. That first one on the bike that I eventually bought was painfully loud when my friend owned it. He couldn't stand it. Hey, you and I rode together out at Moab. What was your opinion of the pipe sound on my KLX? Also, isn't the pic I saw fairly recently on their site, or somewhere, showing an oval can model now? Granted, the internals may not have changed any.

 

I remember your bike being quieter than my HMF noisemaker, and I had the sound reducer in it. Yours had a good tone...but if I recall, it was a little bit louder than those XRs. I'd really like to hear the FMF QC and see what the difference is. And I have a plan for a modified insert for my HMF, along the lines of DAVID R, to quiet that thing down.

 

Just a thought, but the primary effect of loud pipes is reduced riding areas.

 

Well said Automobilist. Loud pipes do serious harm to our sport by stirring up and uniting the general public against us.

As the saying goes,"if it takes a noisy exhaust to save your life, you don't have the skills to be on the bike in the first place".