Yeah on larger tracks the 7 ports just do the trick, but for most tracks the p5 or the plus 4 is perfect, actually better....The 7 ports are really fast, but harder to tune, and nothing compares to the brute torque of the p5....You never feel like you are leaning on the engine to make power down low. If you drive agressive it may be too much, I tend to drive really smooth and gentle so the p5 keeps me up to speed....If you drive really hard the plus4 is better....

You can't go wrong with Nova's latest and greatest Plus 4...It's just a bit pricey....I'd prolly get the plus4 team for 300 bucks....the billet piston seems to last a little longer....

If I just didn't want the p5....

and the 2084 stinks, the 9853 is the best....but most like the 9901...the smooth power of the plus-4 can be pepped up a bit using the 9853ss....

Great advice Matt.....