Just got back from my first ride with the new Two Brothers Racing V.A.L.E.™ M-7 Carbon Slip-on and couldn't be happier with it. Fit and finish is top notch, and Two Brothers makes arguably the best looking exhaust systems on the market... the Carbon Canister version we installed looks awesome on our all black 2009 model WR250X. Sound is really really really good... a deeper exhaust note than a lot of the others we've tried (FMF Q4, Delta Barrel 4). This slip-on is designed to work with the stock WR250R/X header, but we got it to fit our Delta header without any issues. It would not, however, fit the FMF PowerBomb header we tried.
I will post a YouTube sound clip in a few days.
Notes: We also have an FMF EFI Programmer installed, as well as a 12oClockLabs EXUP emulator.
For the last two summers I had been running a Delta Barrel 4 exhaust on the WR250X project bike. It was time to re-pack it so I decided to install an FMF Q4 exhaust system and do some riding with it over the summer. When I originally put the Delta exhaust on, I installed an FMF EFI Programmer for the fuel injection system, as well as an EXUP Eliminator, so those mods were already taken care of. All I had to do this time around was un-bolt the Delta exhaust and bolt up the FMF PowerBomb header and FMF Q4 Slip-On Muffler. Installation was pretty simple and all hardware is included.
The FMF Q4 is probably the most popular exhaust for the 2008+ Yamaha WR250R / WR250X and for good reason... not only does it make the bike sound much better, but it's not overly loud like some exhaust systems. It's still louder than the stock exhaust, but FMF has designed their Q4 Slip-On Muffler to use intricate chambers and baffles that improves air flow while still dampening sound. It really does work and it sounds much better than the stock system, without being deafening.
The Q4 muffler also includes a removable USFS spark arrestor, which is a must if you do off-road riding, and the Q4's aircraft grade aluminum and stainless steel construction will also save a few pounds over the stock exhaust.
Where To Buy:
• WR250X FMF Q4 Slip-On Muffler at SRmoto
• WR250X FMF PowerBomb Header at SRmoto
• WR250X FMF EFI Programmer at SRmoto
• WR250X EXUP Servo Emulator at SRmoto
• WR250X FMF Q4 Performance Package at SRmoto
Last year I had my WR250X dyno'd at a local race shop using their DynoJet dyno. First they did a base run with no modifications, then they installed the following parts...
As you can see from the graphic above, the stock bike had a peak horsepower of around 28.73 (at just under 9,000 rpm) and a peak torque of around 17.95 (at around 8000 rpm). With the new exhaust, FMF programmer, and K&N Filter, the bike ended up with a peak horsepower of 30.75 (at just over 9,000 rpm) and peak torque of 18.79 (at just over 8000 rpm). Overall, the modifications added just over 2 hp and just under 1 lb-ft of torque (compared to a stock WR250X). This might not sound like much, but for a 250 it's not bad.
With the new mods, the bike runs great. When the bike was stock, I noticed a dead spot early in the powerband... the bike just seemed to hesitate at low RPM's before starting to accelerare. That is now gone and it accelerates from a stop much better. The powerband seems to be a little smother overall as well. I'm real happy with the end result.
Motorcycle-Superstore.com is now carrying the Doug Dubach Racing Dr. D exhaust for the Yamaha WR250X and WR250R. One of the nice things about this exhaust is that you can still use the factory plastic heat shield (shown in photo above). It attaches directly to the silencer just like it does to the stock WRX/R exhaust.
Available at: Motorcycle-Superstore.com
NOTE: Motorcycle-Superstore.com only lists the Dr. D exhaust for the 2008 model WR250X and WR250R. It will fit on the 2008-2011 bikes however, so you will have to choose "2008" as the YEAR of your bike.
Other popular WR250X/WR250R exhaust:
• FMF Q4 Slip-On Exhaust
• FMF PowerBomb Stainless Steel Header
• FMF Q4 Package Deal #1
• FMF Q4 Package Deal #2
• Delta Barrel 4 Silencer
• Delta Barrel 4 Full Exhaust System
A week or two ago I had some new mods installed on our WR250X. I also had a bone stock base dyno run done, and then the bike was tuned appropriately after the mods were installed. I will post detailed info about all that, including dyno charts, over the next week or so.
Here are the new mods...