GrimmSpeed Catted Downpipe 3″ – Subaru WRX 2002-2007 / STi 2004-2007 / Forester XT 2004-2008 GrimmSpeed

A downpipe is one of the first modifications that should be done on your car, as the OEM downpipe contains two very restrictive catalytic converters. Replacing these with our single high-flow unit will dramatically improve performance potential while maintaining the use of a catalytic converter. Our complete line of downpipes feature a high-flow, 300 cell catalytic converter, fully machined and contoured flanges and the option to add black ceramic coating. Whether you’re racing time attack or to work and back, we’ve got the perfect downpipe for you.

USA’s Finest Downpipe:

• Proudly made in the USA – Design, Materials and Fabrication
• Innovative 3-D Contour Flange (Limited models only)
• FARO™ Arm Designed – We are at the leading edge of new product design hardware
• Flanges Fully CNC Machined (Limited models only)
• O2 Bungs for factory sensor and aftermarket wideband AFR
• Divorced Wastegate for Optimal flow
• High-flow, 300 cell, metallic substrate catalytic converter
• GrimmSpeed Gaskets Included – A $40 Value!

Limited Features (Optional):

For those looking to take the finest downpipe one step further and wring out every last ounce of performance, we offer our ‘Limited’ line of downpipes. Limited downpipes use flanges made of the very same 1/2″ 304L Stainless material, but are fully machined with recesses for each tube as well as a beautiful 3D contour to smoothly transition the irregular shape of your internal wastegate outlet into our divorced tube for tighter boost control. Limited downpipes also come in a ceramic thermal coated version which are some of the best downpipes you can buy for your Subaru.

NOTE: Once you have added our downpipe to your vehicle, you must be tuned. Replacing your factory catalytic converter sometimes causes a ‘cat converter efficiency’ check engine light. You can either use tuning to delete this CEL or you can use a mechanical fix. GrimmSpeed aftermarket downpipes modify OEM emissions control devices and are intended only for off-road racing applications.

Because this product replaces/removes an OEM emissions control device we must state that this product is for offroad use only.

Note: A Custom Tune is required to run this part safely.

*Pictures for marketing purposes only. Actual product may vary in appearance / style.