GrimmSpeed BB450+ & BB550+ Turbochargers: New Dyno Results Reveal Impressive Performance Gains GrimmSpeed has offered an early look at its next generation of Subaru STI turbochargers, introducing the upcoming BB450+ and BB550+. Designed to replace the existing JB400 and BB500,...
The factory head unit is the weakest part of an otherwise great car. Here's why the IDoing head unit. With wireless CarPlay, a 9-inch touchscreen, and plug-and-play install, it is the best upgrade for your 2015-2021 WRX or STI.
A Subaru STI bypass valve (BPV) releases excess boost pressure when you lift off the throttle and recirculates that air back into the intake system. This helps prevent compressor surge, maintain proper airflow, and keep the STI's MAF-based fueling system...
The WRX bypass valve plays a key role in protecting your turbo while keeping performance smooth and responsive. By recirculating excess boost back into the intake system, it helps maintain proper airflow and drivability. This guide breaks down how it works, why it matters, and whether upgrading is worth it!
Upgrading your STI’s turbo inlet unlocks improved airflow, quicker turbo response, and more efficient performance. A high-quality inlet helps eliminate restrictions in the factory system, allowing your setup to breathe easier under boost. Here’s what you need to know to get the most out of this upgrade.
Your WRX’s turbo inlet plays a bigger role in performance than most people realize, and the factory design often creates airflow restrictions and reliability issues. Cracks, boost leaks, and poor throttle response can all stem from the stock inlet holding your setup back. Upgrading to a high-quality turbo inlet improves airflow, durability, and overall engine efficiency.
