i recommend the 7" K&N. ive seen quite a few people running that and is better than the KKM intake since the KKM causes turbulent airflow. Also, if your looking for the best sounding exhaust, I personally think true duals is the way to go. It can be a bit pricey ($300-1200), but it probably nets the best hp gains properly setup, best sounding with little to no rasp, and gives a deep sound. Other mods you may want to consider that are cheap would be an optimized throttle body and maybe even optimize your secondaries, gut the precats (do not gut the main cat!), clean your UIM/LIM for any carbon build up and possibly port match, and possibly an Apexi S-AFC which you can pick up for like $300. The Apexi may or may not give much more peak hp, but from observing from the dyno day this weekend, after tuning the Apexi, it gave quite a bit more power under the curve through out the entire rpm band. Just my .02
