Once I installed the stainless marine exhaust, the boat feels better out of the hole. My midrange is alot better also. I am rinning 6.2's with 28 lab finished props. either that gps is wrong or it seems like I didn't pick up any top end. also my boat has the corsa exhaust diverter, i believe formula no longer has the silent thunder. Is the corsa restrictive? What do these engines top out at as far as rpm's. where is the gps pod suppost to be under the helm, mine is hanging by the foot rest, could I be getting wrong readings.

Turbo,
I believe they top out at around 5200 rpm's. I'm running labbed 28's at sea level and getting 74mph with no one on board. I put the IMCO headers on my 6.2's. As far as I know, the corsa's would have no restriction whatsoever. Enjoy! You going to supercharge?
-Nick

Have ya tried stepping up 1 size in props? If your at the rev limiter it ain't gonna go any faster, quicker yes, faster no.