A OEM intake range is approx. idle to 6000
The RPM has a range of 1500 - 6500
The M-1 has a range best suited of 3000 - 7000+
A OEM intake work well with mild hop ups for fairly good street machines. No problem making 400 HP & a little more.
A RPM is a excellent intake capable enough to get your car into the 11's while retaining a lot of street clothing. Full interior, wipers, heater, etc... 500+ HP is not a problem.
The M1 single plane works really well in a heavy hitting machine and race cars. Copied and updated from the early years Holley Strip Dominator, the killer intake back in the hay days, this manifold gives up lower end torque for higher RPM HP. It is streetable but better suited the strip. 10 second runs and quicker are possible. Be prepared to lighten your car big time and build a monster motor with race grade everything. You'll pick'en up and lay'em down.
A good general gear ratio range to use with the above intake but not limited in anyway shape or form could be seen like;
OEM, stock Hwy. gears up to 4.10
RPM, 3.21/3.23 up to 4.56
M1 - what ever the best needs, but not less than 3.91
This guide line is just that, a guide line suggested to help keep a balanced power plant and car. This doesn't exclude intake modifications to make the intake perform above and beyond there basic design and intended use.
