SteamSpeed STX 71+ Turbo for Subaru WRX & STI 10cm² (ported) w/ 3" inlet BMW this type of controller would

this type of controller would be used with the larger external wastegates

but typically

the STX is the perfect turbo for those looking fast-spooling response while still being capable of making 350-425whp with supporting mods

SteamSpeed 3 port Electronic Boost Controller aids in superior boost control versus oem spec boost controllers

and simply replace the sticker

SteamSpeed STX 71+ Turbo for Subaru WRX & STI 10cm² (ported) w/ 3" inlet BMW this type of controller wouldIt is well known that upgrading your turbocharger with a larger SteamSpeed STX turbocharger is one of the most cost effective ways to increase power on your WRX STI; however, it is less known that sizing the turbocharger to match your performance goals has a huge impact on how well the turbo works with your other mods, how responsive your throttle is, and how fun your car is to drive. The good news is that we make a SteamSpeed STX turbo to fit nearly