Anyone try putting an exhaust can from a streetbike onto a WR? I'd like to quiet down my bike while still keeping up the exhaust flow; I had an R6 that was ridiculously quiet in stock form and the can still flowed enough for 120 hp so it couldn't have been too restrictive. It was also pretty light since it was aluminum.

Just looking to see if anyone else tried this yet.

Don't think I've ever heard of anyone trying that.

We don't own 4 cylinder sportbikes making over 100hp at the crank displacing 600cc's.

The engineering of a single 250cc engine is quite different. Back-pressure is important.

Love to know what you find out though. Post pictures.

Make sure you have a fuel programmer so you can keep from getting too lean.

I would disagree with motokid on this one - backpressure is not a necessity, certainly not if you believe a Q4 will give you more power. It is a large diameter open pipe - the stock exhaust would generate a LOT more backpressure. An since we're dealing with a slice of an R1 motor, I would think it would work quite well. I have a programmer, but I can't believe the stock R6 can would have any less backpressure than the Q4 - the outlet is much smaller. But all that extra volume is filled with packing to absorb sound.

I can just remember how stupid quiet my R6 was in stock form. The intake made more noise than the exhaust. If I could get the WR to that point I would be a very happy camper.

I'm looking around for some stock exhaust cans. I'll be sure and post up results when I get one.

By all means...I am not an exhaust engineer, or fluid/gas engineer of any sort.


I assume that Yamaha would do their very best to get the most power while still meeting EPA emissions and noise regulations.

I also assume FmF would bypass most of those restrictions and strive for absolute peak performance.


If it was as simple as necking down an R6 canister to fit some aftermarket header....I'd be shocked.

Have at it and take pictures and tell us what you find out.

You might be the next exhaust entrepreneur we all need.

Working on it now. Can is a titanium can from an R1. I have to find a shop to make me up a stainless connecting pipe to hook the can to the header. I put it on as a test before I cut the rest of the pipe off the can. Had to remove the rear wheel to get it in there, but it made me smile. Very quiet. Like, 'wow the intake sure makes a lot of noise' quiet.

That can looks huge on that bike.

Onya for giving it a go, it's good see poeple thinking ouside the box

Let us know how it goes and if you like the results or not

I like your idea toast. More air flow/less noise/no repacking! Here's a link pertaining to putting a GSXR pipe on a DR650. From reading over at ADVrider and TT, sounds like lots of people have done it.

https://docs.google.com/a/mxrob.com/present/view?ndplr=1&id=djwd44j_68fdsm79hf&ncl=true

Wow. I like that Gixxer can a lot better. And with the bolt on exhaust flange fabbing something up will be easier. Time to look on Ebay...

Big score on Craigslist!!!!! Because of all these DR650 riders looking for the gixxer pipes they are really hard to find. I found a guy on craigslist who just posted up the good pipes (2001 1000 with titanium cores) and he was five minutes away. $20!!! It is much smaller and lighter than the R1 can - unfortunately I already started fabbing stuff up and cut the pipe so I can't sell the R1 unit

Spent the weekend doing some fabbing. Wore out a ton of abrasive discs, forgot how hard stainless is.

Stainless 1 7/8" pipe goes over the Megabomb header. Pipe is stepped up to 2" and welded to a 1/4" stainless flange. My TIG welding is a bit rusty, so the welds on the flange are a little ugly...



Here you can see the size difference of the cans



Even with the size difference the titanium core of the Gixxer can winds up making the stainless pipe and can the exact same weight as the FMF it is replacing



Setup is quieter than the FMF, but I'm still not totally happy. The exhaust can has two muffler sections, I can get into the first. I'm going to make a mesh pipe through the first section and pack it with an FMF blanket. I think that will really quiet things down. Acoustical foam is going under the seat and lining the airbox after that - when you yank the throttle the intake snarl is louder than the exhaust. A video will be coming when it is finished.

Mounted on bike





Quick fab of a bracket to hold the stock heat shield in place



This winter the whole pipe and can are going to get sent to JetHot to get coated, not a fan of the heat on my right leg.


Going a different route with the next step to make it quiet. I don't want to have to repack anything, so I'm going to go with a mechanical solution in the form of a dB killer for a Husky TE510. After I put a stainless mesh over it, it will function as a spark arrestor as well. Based on the fact that I've played with my programmer and have wound up with the same settings I would say that I have at least as much flow as a Q4 but quieter. We'll see if that still holds once the dB killer is installed, but from what I've read on the husky forums people are reporting very little loss in power.

How does one post a video clip? Do I need to get an account on Vimeo or some such?

yea or youtube is probably easier.

looks great though

DONE!!!

I had videos with the stock exhaust and the FMF Q4 on my camera but my daughter erased them, so all I have is this:



Doesn't give a good comparison but the sound fidelity is pretty true, that is about the volume compared to my voice in the beginning - I turned off the auto sound level scaling in the camera. Also, I am running an open air box, with the bored out intake horn and a 3" hole in the top of the box running a K&N filter. In this video the seat is just laying in place. After I made the video I coated the two plastic side panels and the underside of the seat with Ensolite foam and that made a big difference. Honestly, it is almost anticlimactic. It did everything I wanted it to do, but it is just so QUIET it is hard to get excited about

If you notice the tip, I'm running a Husqvarna 'db Killer' in it. This reduces the exhaust opening by 1/2", so I thought I would take a hit, but I'm still running the same settings on my programmer that I was with the Q4, 3,5,.5,8,.5,.5 and that is where it performs best so the flow is still there. This is actually a GSXR 750 muffler, not the 1000 pictured above. I'm using it because the opening lets the db Killer slide in snug; the lighter 1000 muffler has a larger opening, so I'm fabbing up a downward slanting tip out of stainless right now. With that tip in place the db Killer will also be a snug fit.

As a side note, the killer might fit right into a Q4, so people might be able to run it there. The only problem is that since the Q4 relies on packing, the way the Killer is designed it might shorten the lifespan of the packing. But if you need to run silent for a day or so it might be the way to go. To find the killer check out Ramz website and look under the TE310 mods he has listed. I ordered it from Hall's Cycle and got it in two days.

I have a buddy with a bone stock WR and my bike is now quieter and much quicker than his. He's pissed. Unfortunately he is the better rider so it all washes out in the woods

Now that you have it set up for that style can, if you wanna save some weight, upgrade to a Yosh RS3. I have them on my SV1K. They are sweeeet.

But they aren't quiet, that was the whole point of the exercise.

The stock can is only 3.4 pounds, so I don't think I could get much weight savings. And the Yosh looks like it uses a 'pipe-with-holes' kind of sound damping (like the Q4) instead of separate chambers so I find it hard to believe it would be as quiet.

The one thing I noticed using these 4 cylinder mufflers on a single is that the inline 4's must have some sound damping due to the the phasing of the other cylinders - a stock GSXR1000 is a LOT quieter using the exact same muffler as the WR. Without the db Killer in it the GSXR pipe is almost as loud as a Q4 and a lot deeper tone. The liter bike sounds like a sewing machine in contrast.

I'd love to see what one of the Shorty Streetfighter Style Exhausts would look and sound like.