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Grimmspeed LIMITED Downpipe Catted Ceramic Coated Black
Subaru WRX 2008-2014 / STI 2008+ / Forester XT 2009-2013
Features & Product Details
The Grimmspeed Limited Divorced and Catted Downpipe is a top-of-the-line fully USA built downpipe. All materials, engineering, R&D, fabrication, etc are straight out of the USA. The tubing is CNC Mandrel Bent 304 Stainless Steel using their custom made bend dies which give you the best fit and performance possible. Please take a second to check out these 304 Stainless Steel flanges...a serious work of art. All 3 sides of the flanges are CNC Machined to perfection. The outlet of the downpipe has a standard 3” 2-Bolt flange that will mate up with most aftermarket cat-backs on the market. They have also included a wideband O2 bung for you if needed. Having a secondary o2 Bung saves you time and money because you will not have to pay a shop to install one for you.
During their design, they utilize their in-house 7-axis FARO™ Arm to obtain extremely accurate fitments. What this means is, they scan all of the mounting points on the car, bring those into their CAD software, and then begin designing the pipe around their scanned OEM data in their Solidworks CAD software. Most downpipes(or exhaust pipes for that matter) on the market are designed using fixtures. Essentially their competitors will create a welding fixture by handoff of an OEM part. This leads to a ton of chances for things to be off. They don't take those chances. They have spent the capital on R&D equipment where others have not.....for you.
For those looking to take the finest downpipe one step further and wring out every last ounce of performance, GrimmSpeed offers 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 GrimmSpeed's 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.
Because this product replaces/removes an OEM emissions control device we must state that this product is for offroad use only.
New hardware and gaskets will be included to make this downpipe ready for the installation. Also, note that this particular downpipe will come with the black ceramic coated finish to provide extra protection against rust and corrosion, and to lower underhood temperatures.
Please Note: You will need to slightly adjust the divider tab to fit a VF40/VF46 turbo. It’s a very simple process but please contact our customer service representatives if you have any questions.
Product Video
Specifications
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REVIEWS & CUSTOMER MEDIA
I had this installed along with getting a tune and this has made probably the most dramatic difference of any part so far. My turbo spools earlier and so much harder. The build quality is beautiful and the attention to detail is excellent.
Honestly, I love it, but unfortunately I can’t write a review of the downpipe itself due to install of tomei’s unequal length headers and uppipe all at the same time in my ‘13 WRX. It is RIDICULOUSLY loud and personally I love it. But then again that’s probably the new exhaust manifold. Spool is a lot quicker and you definitely feel the torque. It’s sooooooo nice to hear the turbo whistle. However I did run into a short issue with an exhaust leak from the flange of the cat-back to the downpipe, decided to flip the gasket over and it did help alittle bit but it was still leaking. Ended up buying another gasket and the same problem occurred, can only assume the flange from the downpipe was warped because I never had an exhaust leak from the stock catalitlic converter? Ended up just using Permatex exhaust gasket repair and it sealed it right up!
Fit my 2016 STI perfect after trimming the factory heatshield. Seems to be performing well with the Cobb Stage2 OTS map and fitment was perfect for my Tomei Expreme Ti Catback. Only gripe was the bell shape of the DP near the turbo manifold bolts made things a tight squeeze for wrenches but that seems to be more a limitation of going with a higher diameter downpipe than anything else. Also removing the TMIC helped with the install big time.
I bought this downpipe because of all the awesome things that I have heard about it. I was not disappointed, The quality of the downpipe is amazing, it is a piece of art! I almost did not want to install it because it is so gorgeous. Noticed better throttle response and less lag right after installing it with the accessport stage 2 map! If you are thinking about getting this downpipe stop thinking about it and just do it!
Unbelievable fit and finish, superb workmanship. Made in the US. Excellent mod, great performance with a good tune. Highly recommend.
QUESTIONS & ANSWERS
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Q: AEM Wideband Jason Z.11 months ago
I plan on installing an AEM wideband with this and taping into the factory secondary O2 sensor to monitor on a Cobb Accessport. For this application would I use the forward or rear O2 bung?
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A: For the Wideband sensor, you would want to use the upper bung that sits on the top of the downpipe right next to the turbo. You'll want to keep your stock O2 sensor in the lower bung. Thanks!
Rick C. @ RallySport Direct 11 months agoWas this answer helpful?
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Q: Cobb accessport Totalnoobie2 years ago
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A: You should be fine since this downpipe is catted
Tylo AkionaWas this answer helpful?
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Q: gaskets at2 years ago
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A: This will come with all the gaskets you need, as long as you have a 3 inch exhaust.
Michael N.Was this answer helpful?
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Q: Fitment stevemcfadden11808912 years ago
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A: This will work with your stock exhaust. GrimmSpeed offers an adapter to make it perfect. Depending on the age of your car and miles, you may want to replace the studs in the turbo. You will need to trim your stock heatshield or buy an aftermarket.
Michael N.Was this answer helpful?
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Q: DP wrapping Gabo 2 years ago
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A: I would not recommend wrapping this downpipe.
Devan M. @ RallySport Direct 2 years agoWas this answer helpful?
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