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

Design
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.

Materials
Nothing says serious business like using the proper materials for the application. The flanges are machined from a 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.

Fitments

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

- Works with 45mm Turbosmart and 44mm Tial wastegates (sold separately)

Availability

For a limited time, the GrimmSpeed 3-bolt EWG up pipes will be available exclusively through RallySportDirect! Visit their website or get in touch with their sales staff for more information or to place your order! Of course, we're always available to answer questions and would be happy to put you in touch with someone at RallySportDirect that can help you!