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Porting the turbo - Audi Forum - Audi Forums for the A4, S4, TT, A3, A6 and more!
Internal Wastegate Porting (Broke & Boosted Ep4.1) – The Car Passion Channel
SteamSpeed STX 76 Turbo for Subaru WRX & STI 8cm² (ported) – steamspeed.com
Project Street Sleeper Part 4: New Turbo Assembly & DIY Turbo Porting - YouTube