Have seen the Reher Morrison 2 piece one work well within a narrow RPM range (target range) on a 400.
It was probably correcting a runner length / cam / exhaust tuning issue, but with a single 4 it's a little hard to change alot there.
Trial a d error is the only way, and it may only work in a narrow range, but it could be a cheap fix for a hole in a Tq curve as well until the real issue is found./solved
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Working on going faster (and now staying dry at the same time !!)
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