Titanium 4.1 full system with MegaBomb header
$899.99
Sound: 98.0 db
Weight: Header: 1.8 lb
Muffler: 4.3 lb
System: 6.1 lb
When combined with the MegaBomb header, this gave the CRF some serious snap on the bottom and a hit in the midrange with enhanced throttle response everywhere. The full system also pulled longer and harder on top. If you like your throttle to deliver snappy power without using the clutch, this system is for you.
With 94 db insert:
Sound: 95.1 db
Weight: Header: 1.8 lb
Muffler: 4.3 lb
System: 6.1 lb
Here the snap is tamed, especially on the bottom, making the combo a lot easier to ride for some riders and without feeling like the bike lost much power anywhere else. It also seemed to let the power last longer up top. Plus, it was noticeably quieter to the rider and on the track, which was great.
Two Brothers Racing
www.twobros.com
V.A.L.E. M-7 stainless/carbon fiber slip-on exhaust system with P1 tip ($29.95)
$529.98
Sound: 98.5 db
Weight: Muffler: 4.8 lb
This system put the power to the ground and was noticeably smoother and more linear than stock, actually seeming to slow down how quickly the bike revved up without slowing down the bike. It felt like the same power level on the bottom while gradually building up with more than stock on top. Pro riders who use a lot of snap said this pipe felt flat unless they were in the top power. This was a vet- and novice-friendly pipe for sure.
Dubach Racing
www.dubachracing.com
SS/Al full system with spark arrestor removed
$ 549.95
Sound: 97.6 db
Weight: Header: 1.9 lb
Muffler: 5.0 lb
System: 7.0 lb
The Dr. D pipe was a noticeable boost on the bottom and mid for all of our riders, and up top it had more usability than stock. It felt like there was more power up there as well, like you could easily let it rev out instead of shifting in some cases without hitting the rev-limiter. But for sure the best part was that it gave pros the snap they needed without making the bike harder to ride. For those not excited about a lot of hit, this system was a good performer (even though the pros felt the bottom-end boost).
Late Arrival:
Leo Vince full titanium system
www.leovince.com
This $899 exhaust made it in for our last ride day and came across as a very strong and smooth bottom and midrange pipe that fell off on top and didn't rev out much. But it was faster than it felt-very quiet on the track-yet we were not able to sound test it.