-40%
GrimmSpeed Downpipe 3in Catted Limited For 02-05 Subaru WRX/04+ STi/04-08 FXT
$ 326.83
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Description
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Product Description
GrimmSpeed Downpipe 3in Catted Limited For 02-05 Subaru WRX/04+ STi/04-08 FXT
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.
Design - We use 3D scans of 10-15 OEM downpipes to identify the variances within stock parts and ensure that our fitment is perfect across the board. We then pull those scans in 3D CAD and design our 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, we used a reduction process to smoothly transition from the 2.5" turbine outlet to our 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 we've added will save you time and money when you decide to use a wideband O2 sensor/gauge in the future.
Materials - Material selection is a very important, but often overlooked, part of an aftermarket exhaust system. The tubing we chose is a thick 3in, 16ga 304L Stainless Steel tubing and our meaty 1/2" flanges will resist warping and leaks in even the most extreme environments. Stainless steel, particularly 300-series alloys, have terrific durability and corrosion resistance but are still quite cost-effective for fabrication of this type. Lower grade alloys (400 series, for example) may be more prone to corrosion over time, reducing the life and beauty of your parts while higher grade alloys introduce unnecessary cost. All flanges use a fully-machined bolt pattern to ensure very tight tolerances and flawless fitment. Each tube is CNC mandrel bent and CNC laser cut for perfectly repetitive fitment and accuracy. The catalytic convertor that we've selected is custom sized and utilizes a metallic substrate for increased effectiveness, higher flow and better durability than other, lesser units. We selected a 300 cell count mantel for a perfect compromise of performance and function.
Features
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 Value!
Applications
2002 - 2007 Subaru WRX 2004 - 2007 Subaru STI 2004 - 2008 Subaru Forester XT
Please 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.
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