Adjustable Diverter / Blow-Off Valve for Select Turbo Mitsubishi & Subaru

The GFB Respons TMS T9033 isn’t just another dual-port blow-off valve — it incorporates GFB’s patented venting bias adjustment system that lets you control how much air vents to the atmosphere versus recirculates back into the intake.

Fine-Tune Your Sound Without Sacrificing Driveability

Traditional full-atmosphere valves can cause stalling or backfiring on cars with sensitive airflow meters. The T9033 allows precise adjustment between 100 % recirculation and 100 % atmosphere venting, so you get the sound you want without the common issues seen with fixed-ratio valves.

Enhanced Throttle Response & Boost Stability

By venting air only when needed and in the right proportion, the TMS design helps the turbo return to peak boost faster after gear changes and reduces compressor surge. This results in a more responsive driving experience compared to stock diverter valves.

Direct Fitment for Supported Models

This valve is supplied as a complete bolt-on unit for compatible Mitsubishi and Subaru models — no cutting, adapters, or splicing required. Simply remove your factory valve and install the Respons T9033 in its place.

Quality Construction

Made to GFB’s engineering standards, the T9033 is built to handle the demands of performance driving while offering tunability that rivals aftermarket alternatives, all while maintaining reliable operation on street vehicles.