SB: I'm sure there are formulas out there somewhere but I've never come across one.
I used to use a book way back by Phil Irving when building pipes for my old 4 stroke motocross bikes but it's not applicable to multi cylinder motors so no use here.
Agreed 100% on the drone issue it drives...
Hey Larry,
Sorry didn't realise that as our NA's have the bypass cooler.
GTE Pump has a longer gear set for more volume per revolution I used them in my NA's.
Exhaust tuning is a bit of a black art, the 1st dual mid muffler I made worked well was fairly quiet but the second one with just a change in volume and shape is much quieter.
As SB said the size/shape/location in the pipe is important and is what sets the expensive exhausts apart from the...
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