which stock style exhaust flows best?
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which stock style exhaust flows best?
i started wondering because i have a pair of 93 Indmars on the Hatteras. rated at 350 hp. peanut heads. another thread has a 300 hp merc 454. of course the Indmars may be rather optimistically rated, although the exh hole at top of manifold is a bit larger than the merc one. i also think Merc might have rated that 454 a little low for other reasons. like the diff between a 9.9 outboard and the same model rated at 15. diff is writing on engine cover so it is legal in 10 hp limit areas. anyway, has anyone done any research on this?
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i started wondering because i have a pair of 93 Indmars on the Hatteras. rated at 350 hp. peanut heads. another thread has a 300 hp merc 454. of course the Indmars may be rather optimistically rated, although the exh hole at top of manifold is a bit larger than the merc one. i also think Merc might have rated that 454 a little low for other reasons. like the diff between a 9.9 outboard and the same model rated at 15. diff is writing on engine cover so it is legal in 10 hp limit areas. anyway, has anyone done any research on this?
I know merc upped the rated hp to 330 on the mpi. The motor seems the same from the older ones.