I have an 04 749 with a cored-out stock exhaust. I installed the exhaust and brought it to a local shop known for their expert service (BCM in Laconia, New Hamshire, USA). They optimized the stock computer's air/fuel mixture using the Mathesis Tool. I made 100 hp at the rear wheel and 54 ft/lbs. of torque on a conservative dyno. The bike has no flat spots. They install SIL Moto exhusts all the time. They do not come with a ECU. The stock ECU can be modified to any exhaust.
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