The STM 3.5" Aluminum Intake Pipe was designed specifically for Evo 8/9 bolt-on FP Turbos such as the Red, Black, Zero and Zephyr (3.25" inlets) but can also be used with a stock turbo by selecting the 2.5" coupler, or any 3" aftermarket bolt-on turbo. Features a 3.5" aluminum intake pipe, 9" long K&N filter and a high-quality silicone reducing coupler to match your turbo. Vehicle Fitment: 2003-2006 Evolution VIII IX • Designed for Bolt-On Turbos • For Speed Density Only • Does not work with the MAF • Fits both ACD and NON-ACD models. • Can be used with the STM Sealed Catch Can (with -10AN Bung) Speed Density: This intake pipe does not work with the MAF, and is used for speed density only. ACD: The STM 3.5" Intake Pipe will fit both Evo 8 and 9 and will clear the ACD reservoir. What's the Bung For? Adding the -10AN bung on the underside of the pipe is allows you to use the STM Sealed Catch Can which vents from the can to the intake pipe. Install Notes: If you're not using a catch can, we would suggest to vent your crankcase via the valve cover. Features: • 3.5" Tig-Welded Aluminum Piping • Huge 9" K&N Air Filter • Fits ACD & Non-ACD • Optional -10AN Fitting for STM Sealed Catch Ca • For Speed Density Options: • -10AN Bung • Coupler Size for Turbo • Brushed Aluminum • Polished Aluminum (+$30) • Gloss Black Powdercoat (+$30) • Wrinkle Black Powdercoat (+$30) Includes: (1) K&N Air Filter (RE-0920) (1) STM 3.5" Aluminum Pipe (1) STM Reducing Coupler (2) Worm Clamps for Coupler