New Graves EVR Full System Exhaust

Looks great! thanks for the write up.
I'm just about to pull the trigger on an exhaust and I think this is the one.

Nels @ 2wheeldynoworks has one

I guess time will tell.

Looks great!! I love my Yoshimura pipe, after trying Two Brothers and Hindle.
Exup cables are gone , sensors are gone, power is good from bottom all the way through.

Enjoy, looks good

Reference to the EVR Nels can take care of you. The low end throttle response is incredible and it leaves you the ability to use a shorter silencer without destroying or loosing power.

What Chuck Graves the president of Graves Motorsports has to say about the release of Graves’s newest line of exhaust systems, EVR and the technology behind it.


“The EVR or Exhaust Valve Type R is and electronically controlled valve that improves drivability at small throttle and low RPM ranges where it matters most to the rider. The systems can also be utilized to reduce sound by a significant amount without reducing maximum power output.”

What makes the Graves EVR different than the stock exhaust valves that racers commonly remove when the stock system is replaced with an aftermarket race system?

That’s pretty simple, we install it in a race system and tune the electronics to maximize efficiency. The current trend of sport bike enthusiasts has been attracted to short silencers simply for looks. Power output and drivability has been sacrificed exclusively for the trendy look. Secondly the sound levels of many of these systems has reached the level of irresponsible and annoying for even the youngest riders. The aftermarket has responded with sound inserts to bring these short power robbing systems to an acceptable level. The real drawback to this is that once the sound inserts are installed the rider can now really feels the negative effect of the system in overall performance decline substantially. In most cases, I’d say 99.9% of all motorcycles that I have tested, the power output and throttle response is now far worse than the stock exhaust. With the EVR by Graves we solve all 3 issues, the power output, throttle response and the sound.

Who else uses this system on their race pipes?

Only Factory Moto GP teams are using it at the moment. Most of them all are well hidden!
Why hasn’t this been done by the aftermarket before? Again that’s pretty simple. Cost! To drive the valve requires hardware and software. At minimum you need an ECU capable and a motor. The emergence of ECU flashing has given us the ability to do this at a reduced cost because we can now control the stock ECU motor controls. We have designed our EVR systems to accept the stock motor and cables. This makes for a really clean setup.

So is the FTECU flashing system is required to optimize the EVR exhaust system?

That is correct. Anytime you replace the stock exhaust system with an aftermarket racing system it requires changing the fueling. In addition to air fuel requirements the modern motorcycle engine control systems cannot be optimized by piggyback system so the flashing of the ECU is common place. Graves has partnered with FTECU to manage these strategies to enhance our exhausts systems performance just as a Moto GP team would do.

What if I already have a flashed ECU?

What Graves has been telling our customers is that they should purchase the FTECU flashing kit when they purchase an exhaust from Graves. Graves provides maps for the user to install in their motorcycles ECU. We tell them that by having the FTECU flashing system in their tool box they can update their ECU whenever Graves publishes a new map. If they have the system already then an updated map is all that they will need.

For which motorcycles is EVR currently available?

We are developing every day to add more models to our list, but as of printing, we offer EVR for the following:
2015 – 2017 Yamaha YZF R1 2016 – 2017 Yamaha MT/FZ10 2017 Yamaha YZF R6

Stainless Steel CAN rust. Usually it's at weld points.

"A form of rusting in stainless steel is after the stainless has been exposed to very high temperatures, often in the 750-1550°F range (400-850°C)1. This type of corrosion is often seen in welding applications in which stainless is heated and then cooled. If this happens, “sensitization” can occur which is where the carbon and the chromium bond together in the stainless steel and form carbides. These carbides situate themselves at the stainless steel grain boundaries, and the grain boundaries become deficient of chromium. With lower chromium concentrations at the grain boundaries, the chromium oxide protective layer can become discontinuous and rusting becomes possible. “Sensitization” can ruin stainless steel forever; however the damage can sometimes be mitigated with complex heat treating."

just ordered EVR 3/4 system through 2wdw. I'm very impressed with this forum's vendors thus far.

Does anyone know the RPM at which the EXUP opens please for this system with the 2wdw ECU upgrade.
I ran with the original Graves map on my SP for a while , bike rang great , though it didn't see quite as sharp as stock.
When I had it dyno'ed with the graves map it was almost identical to a stock bike , except without the weight and a much better sound.

I've since had it dynode again and a Woolwich map put on which has made the bike a lot sharper , however it opens the map a lot later ( about 6.5-7K) which is too late , hence the question about the valve opening on the 2wdw map , thanks in advance.

For the record the quality is absolutely superb on this system , even after 6k miles it still looks great.