E-tec fits on sst45 mid

[Yellowjacket]

yes but long exhaust is all about low end power, perhaps run a rotax pack as the sled guys have full access to programing an e-tec

No, this is a pipe that is tuned to high power. For optimal power in a single pipe resonance (as this pipe is tuned for) you need a long pipe. If you look up the introduction of the 2 cylinder ETEC's in 2006 there is not only the curves I've shown below, but also how the geometry of the tower was modified for this later version.

For midrange they inject water into the pipe to increase midrange power. The pipe when dry is tuned to provide a power increase in the 5000 to 5500 rpm range. You can see clearly what the power curve looks like dry, the engine comes "on the pipe" above 4500 when dry and that tuning is for max power. When they inject water it provides more power in the range of 3500 to 4500 rpm.

Here is the power curve for the 60 ETEC as published by Evinrude. As you can see the pipe when water isn't being injected is tuned to give max power at high rpm, it isn't tuned for midrange. If you take the pipe off you're going to take a beating at high power. Tuned pipes work over a range of power. The pipe with water injected is still helping at high power, but its gain is rolling off over 5000 rpm. If you took the pipe totally away you'd get hurt pretty badly at high speed.