Yamaha R1 (2004-06) Slip-On Exhaust Systems: Two Brothers exclusive V.A.L.E. mounting system eliminates the need for springs resulting a more secure mounting. Huge horsepower gain of 6.7hp @ 7500rpm on the 04-06 models (right where you can use the extra power) and a peak horsepower of 4.1hp @ 11,500rpm. Total peak horsepower leapt from 152.7hp to 156.8hp simply by installing the TwoBros M2 slip-on exhaust system!
Stock Weight= 9.1 lbs.
TwoBros Weight= 8.0lbs.

Yamaha R1 (2007) DUAL M-2 Slip-On Exhaust Systems:
Yamaha’s 2007 R1 has caused quite a stir since its introduction. We're still waiting for the dyno stats but power and torque gains should be similar to the 04-06 version or better. The M-2 system will reduce weight, increase torque & horsepower and dress up the look of your bike with this dual canister slip-on high performance exhaust system exclusively from Two Brothers Racing.

The Two Brothers small oval M-2 V.A.L.E.™ exhaust system features our exclusive Teflon coated, blunted, cast magnesium outlet that not only looks great but also allows for various silencer inserts.

The V.A.L.E.™ inlet design eliminates the use of springs and creates an adjustable mount that is solid when fixed in place. The system also features a thinwall s-bend tube that connects to the factory header pipes.

Specifically designed to meet the unique requirements of performance road bikes, our P1-R PowerTip™ sound suppressor is a recommended accessory for our exhaust systems with M Series outlets using a 2.25" core. A straight-through sound diffuser, the TBR P1-R PowerTip quiets the pipe by 2 to 3 dB with no significant loss of horsepower.

Note: We offer optional TBR P1 PowerTip™ sound suppressors (a $30ea option) with all TwoBros exhaust systems with M2 outlets. We suggest you try the M-2 first then decide if you need to tone it down a bit. The P1sound suppressor is a straight-through sound diffuser which quiets the pipe by 2 to 3 dB while actually adding measurable HP gains from the middle to the top of the powerband. Easy to install - simply unbolt your existing M series endcap, drop in the P1 and reassemble.