I've had my 6mt for about 4 months and have been resisting the urge to do any mods. I'm not really up on all of these, what they do, and how they work. (also how the impact the warranty.)

Anyway, I'm now looking to do some simple mods that would get me up around 300hp and was thinking of the following:

FI or CAI
Ultra S Crank Ply or Ultra SS Plys

Can someone help me out and also explain exatcly what the effects will be and if there are any drawbacks.

Thanks, just trying to learn before I take the plunge.