Just removed the resonator, and airbox, purchased a single 2.5" AEM Cone filter (made for them by K&N) from Options Auto - and simple install. BIG gain in HP noticeable. NICE sound when accelerating.

Side effect: semi-annoying whining sound at idle. Like a whistling sound from the air going in.

Hyper Ground Wires installed next. Easily another 2-3 HP. Could be felt. Easy to install - and locate poor factor grounding places.

The rest of the wires are for HID headlights, PIAA foggies, and Sub going to an Optima Marine Blue Top Deep Cycle battery.