AEM and Injen are the best. They're approximately $200. And probably take less than 30 minutes to install with basic tools (socket set and screw-driver)Personally, on my car I have a SRI. The performance gained by a CAI over a SRI are minimal (maybe 1 hp), but the peace of mind due to the reduced risk of hydrolocking is well worth it.BTW, hydrolocking is when water gets sucked up the intake and into the engine by driving through a puddle. The piston hits the water in the cylinder and, since water does not compress, the result is a catastrophic failure of the engine (broken pistons, rods, head, block or all of the above)