External Wastegate Up Pipe w/ Dump Tube 3-Bolt Inlet, 38/40mm V-Band WRX/STI/LGT/FXT

SKU: 007067
( 1 Review )
3 Port Boost Control Solenoid
Internal Wastegate Bracket
Turbosmart External Wastegate

Current stock: 0

It appears that you’re not the only one with excellent taste in premium automotive components! Unfortunately, the coated version is temporarily out of stock, however should become available soon. You can still place your order and be put in a queue; the item will be shipped ASAP. Please contact our customer service via email or phone (612-379-0000) with questions, or check for availability with our retailers, thanks!

The perfect EWG solution for 3-bolt headers. 


An External Wastegate (EWG) allows exhaust gases to be diverted prior to entering the turbo. This facilitates lower backpressure at the turbine, allowing for increased boost control, faster spool-up and greater top-end power. The GrimmSpeed EWG Up Pipe has a larger internal diameter than your stock unit, allowing a higher volume of exhaust gas to reach your turbo more efficiently. This helps maintain boost levels further into your RPM range. Depending on your specific setup, these improvements can net a 10-40 HP increase. An internal wastegate can create a larger amount of turbulence in exhaust flow through your turbine housing; moving to an external wastegate eliminates much of that turbulence and isolates the turbo from what little turbulence still exists as your wastegate opens and closes.

Quick Specs

  • 3-Bolt Inlet Flange fits most 3-bolt headers!
  • 321 Stainless Steel Interlocking Flex Section - Reduces fatigue and facilitates thermal expansion
  • Contoured EWG Side Outlet - CNC bent and laser cut, this EWG exit allows exhaust gas to exit with maximum efficiency
  • 2.0mm Tube Thickness - 33% Thicker than the competition
  • 1/2" Stainless Steel CNC Flanges - Fully machined, these beefy flanges offer perfect fit and transition every time
  • 10+ WHP Gain - Ask your tuner what you can expect based on your particular setup and goals!
  • 1.85" Inner diameter - Supports 600whp+
  • FARO Arm Designed - Allows more precise design and a stronger, better fitting product

The design of each up-pipe begins with 3D scanning of the factory exhaust system, motor, subframe, firewall and downpipe. The GrimmSpeed line of 3-bolt up-pipes also involves data collection from a number of aftermarket 3-bolt headers to ensure the best possible fitment. The 3-bolt inlet flange uses a machined 45 degree transition to smoothly narrow the ID of the up-pipe to the perfect size for your stock-location turbo. The completely redesigned interlocking flex section facilitates fitment with other aftermarket components that may not be manufactured to the same exacting specifications. Additionally, the inclusion of a flex section relieves your pre-turbo exhaust system of the stresses associated with thermal expansion and contraction.

Nothing says serious business like using the proper materials for the application. The flanges are machined from 1/2" thick 304 Stainless Steel plate. Tubing is CNC bent and laser cut from 14ga 304 Stainless tubing. The flex sections are made of 321 Stainless and are designed with natural frequencies that avoid those of the Subaru exhaust system. This prevents the flex section bellows from achieving resonance with the exhaust system, eliminating a massive source of fatigue. After each of these parts is manufactured and inspected, the entire assembly is TIG welded. Finally, flanges are checked for flatness before packaging. Of course, premium GrimmSpeed stainless steel gaskets are included with each pipe to ensure a perfect, leak-free seal.


- Confirmed fitment with Tomei, GT-Spec and eBay replica 3-bolt headers

- Works with 40mm Turbosmart and 38mm Tial wastegates (sold separately)


1 Review

Josh Stancil 15th Feb 2018

Great Quality

I had bought the 2 bolt version of this uppipe before hand and was extremely happy with the Quality that i clearly had to buy the 3 bolt version once i had bought a tomei UEL header. The flange is extremely thick as well the pipe itself. it comes with studs for the top as well as the nuts, gaskets top and bottom and the hardware to bolt it to the header. my only real complaint(which isnt one towards grimmspeed) is it is a little harder to install the tomei 3 holt header with the 3 bolt design. the flex coupler did help but what i had to do is slide the header up and while my buddy held it in place i put a bolt in the top one while it was tilting the uppipe down and loosely held it in place. it also was a little difficult getting the flange throught the stud because the flex coupler was right there. After a little time and once getting it past that it went in quickly afterwards. Again that obviously has nothing to do with grimmspeed but figured it may help the next person going.

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