Grimmspeed - LIMITED Downpipe Divorced Ceramic Coated Catted (inc. 08-14 WRX / 08-17 STi)
   Quick Product Info
Brand: Grimmspeed
Part #: F-GRM-007098
Catalytic Converter: Yes
Ceramic Coated: Yes
Hardware Inlcuded: Yes
Material: 304 Stainless Steel
Mfgr. Warranty: 2 Year
Piping Flex Joint: No
Piping ID: 3in
   Confirmed Applications
2008-2017 Subaru STi
2008-2014 Subaru WRX
2005-2009 Subaru Legacy 2.5 GT
2006-2009 Subaru Legacy 2.5 GT spec.B
2009-2013 Subaru Forester XT
2005-2009 Subaru Outback XT
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Product Details

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 the Grimmspeed single high-flow unit will dramatically improve performance potential while maintaining the use of a catalytic converter. Whether you're racing time attack or to work and back, Grimmspeed got the perfect downpipe for you.

Grimmspeed use 3D scans of 10-15 OEM downpipes to identify the variances within stock parts and ensure that their fitment is perfect across the board. They then pull those scans in 3D CAD and design their downpipe with flange locations, transmission tab locations, O2 bung locations, firewall clearances and material selection in mind. Bend locations, tube lengths and divorced wastegate re-entry point are all checked for healthy flow using CFD (computational fluid dynamics) simulations in CAD. With even the largest stock location turbine outlets utilizing factory exhaust gaskets, they used a reduction process to smoothly transition from the 2.5" turbine outlet to their 3" downpipe material. The outlet of the downpipe has a standard 3", 2-bolt flange that will mate up with most aftermarket catback exhaust systems and the secondary O2 bung that they've added will save you time and money when you decide to use a wideband O2 sensor/gauge in the future. 

Limited Features
For those looking to take the finest downpipe one step further and wring out every last ounce of performance, Grimmspeed offer their '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 thier divorced tube for tighter boost control. In addition to the machined flanges, limited downpipe tubing material has a brushed finish, for a more uniform, refined appearance. NOTE: Once you have added their 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.