i'm building a 80cc big port metra
and i was thinking about this pipe
untill a friend advised me that a 30mm header
may not allow enough backpressure
for the chamber to be effective.
i was going to run a mik 24 (since i have one)
but i could run a del 21.
i was planning on getting that pipe
making an intake, and matching the exhaust port to the pipe
and the intake to the carb
and then just cleaning it up and tuning it.
its going on a a55 bottom end.
should i be concerned about the back pressure?
am i going to eff up the port timing by matching it to the header?
cause otherwise i'll just get a simo, i suppose.
thanks "cool dudes"