If your jurisdiction has an inspection program, or has its police inspect bikes that are stopped for any other reason, you will be in a world of hurt when you are given "x" days to restore the exhaust system to a legal state, because the M4 Street Slayer requires you to CUT that blob out of your system, NOT unbolt it (no provisions on it to unbolt), so you will have to buy another blob/header assembly (it's all one piece).Īlso, the gain you get in power is ridiculously small. However, I havent seen this available for the R3. Educate yourself via Google searches before you spend the money on the exhaust.Īnd by the way, in removing the blob, you are removing an emission controls device, which is illegal to do in california and many other jurisdictions. I know for other Yamaha models its pretty popular to get the stock ECU reflashed. The ECU reflash will likely cost at least $250, and the Power Commander and Bazzazz are both more than that.Ī posting threrad is not an appropriate place to try to explain to you how the ECU reflash and Power Commander or Bazzazz differ in their approaches. THAT's why you need either an ECU reflash or a Power Commander or a Bazzazz fuel controller.Īll 3 of these choices are quite expensive. That blob contains both a catalytic converter and some exhaust muffling, so rmeoving it changes the exhaust restriction a LOT, increases the airflow, and necessitates more fuel to match the increased airflow. ![]() You actually have to cut the giant and heavy "blob" under your transmission out of your exhaust system in order to fit the M4 Street Slayer onto the bike. The M4 Street Slayer shsould not really be called a "slip-on" exhaust, because it does NOT just "slip-on".
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