GrimmSpeed External Wastegate Setup

GrimmSpeed External Wastegate Setup

This Grimmspeed External Wastegate setup features a 2-bolt Up Pipe Kit with a 38/40mm external wastegate flange, and a Turbosmart Comp-Gate 40 External Wastegate. This setup allows owners to convert their internal gated setups to an external gated option. The benefit of an external wastegate is that it allows exhaust gases to be diverted prior to entering the turbo which will create a faster turbo spool, and because the external wastegate has a larger diameter than the stock internal wastegate, it allows the exhaust gases to be released faster which improves boost control, and it promotes longer life in the turbocharger. More importantly, moving the wastegate out of the turbocharger will relieve a large amount of turbulence that the stock internal wastegate will create.


Grimmspeed fabricated this up pipe from quality 304 stainless steel materials with thick 12mm flanges that will not warp. The flanges have been CNC cut for perfect tolerances and a flex section has been added to extend the lift of this up pipe, and it will allow for expansion and contraction without cracking, and it will lead to fewer exhaust leaks. With a good tune, users can expect gains of 15-40WHP when tuned for an external wastegate. 


This kit includes:


- Grimmspeed 2-bolt 38/40mm External Wastegate Up Pipe with Dump Tube.

- Turbosmart Blue Comp-Gate 40mm External Wastegate.

- New Gaskets and hardware


Add-on options:

- Internal wastegate bracket ($40)  - this bolts in place of the internal gate on a turbo to hold it closed.  It is possible to fabiracate your own bracket or weld the wastegate door shut but we reocmmend this option becasue it is easy and clean.


- Ceramic coating ($40) - this option is adds a protective coating to the up-pipe to keep heat in and corrosion away.  Corrosion typically isn't a big issue but it can be in harsh climates but keeping the heat in can keep the heat away from the engine bay and improve spool and response.

- 3 port boost controller - a stock 2 port style boost controller (EBCS) is not suitable to control an external wastegate so add this option to include a GrimmSpeed 3 port EBCS if yours is stil stock as this will be needed for this wastegate setup.


2002 - 2014 WRX
2004+ STi

    Internal Wastegate Bracket
    Ceramic Coating
    3 Port EBCS

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