Compatible: (2.0L/2.5L)
2002 - 2007 Subaru WRX
2004 - 2007 Subaru WRX STI
2004 - 2008 Subaru Forester XT
THIS PRODUCT CANNOT BE SHIPPED TO CALIFORNIA
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!
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.
As engineers and enthusiasts, we take great pride in the work that we put into our design process and it shows in the finished product.
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.
Fabrication
This is where the rubber meets the road. Every single 02-07 downpipe is welded in the exact same master fixture. Our competitors build their welding fixtures around a single OEM downpipe. We build our fixtures to the average (found using the CAD data mentioned above) of a number of OEM downpipes and turbo/catback flange locations. We periodically re-check our fixtures using our FARO arm to ensure that heavy use and heat cycling don't affect their accuracy. Each downpipe is TIG welded by our expert welders. Don't be fooled by shiny imitations where a robotic TIG pass has been made over a wire-fed MIG weld; real TIG welding takes the skilled hand of a true craftsman. We take the structural integrity and beauty of our work very seriously and when you handle your new GrimmSpeed downpipe, you'll know it.
Limited Features
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.
GrimmSpeed was founded in 2006 to provide customers with innovative and highly engineered aftermarket products. On a more personal level, we are a group of car enthusiasts in the lovely city of Minneapolis, Minnesota who are absolutely passionate about what we do. Our bread and butter started out anything Subaru. However, after growing our team and engineering expertise, we started developing products for Mitsubishi, Ford, MazdaSpeed, and Hyundai markets. We are a true garage start-up (single stall townhouse garage in Maplewood, MN) and we've been lucky enough over the years to be able to turn it into exactly the business we had dreamed of....actually, much more. We have a wide breadth of product offerings including: intercoolers, exhausts, intakes, gaskets, engine pulleys, phenolic spacers, boost controllers, and many more.
Most of our decisions at GrimmSpeed are based on 3 basic principles:
1. Innovation
Our team knows that if they propose a project there has to be at least one new innovative feature. It may be a completely new idea or an innovation to a current product on the market. We truly love creating products that really work and make an impact on the enthusiast community.
2. Keeping Jobs in Minnesota
Lets face it, manufacturing in the US has been lost for a long time. It's sad because manufacturing is what this great country was founded on. Our goal is to do our part in bringing it back to the US. Lets show the rest of the world that we do still 'have it'. Almost all of our partners are right here in Minnesota, most of which are within an hour drive of us. Its not always about the $$ and we are here to prove that.
3. Customer Service You Deserve
What flies for customer service these days just continues to astonish us. We don't have to tell you guys, I'm sure you are all well aware of some of the terrible customer service that goes on these days, especially in our industry. Our goals are to be honest with you, if something is going to be delayed, we aren't going to give you some made up date when it will be ready....we will tell you exactly the most current info we have. If you need help installing our products we will be there on the phone or email ready to help until you have figured out the issue. Last but not least, we will keep our word. If we say we are going to call you back, we actually will.
-Justin Grimm
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