AWE Tuning Audi RS3 / TT RS 4.5in S-FLO 4in Turbo Inlet CouplerAWE Tuning Audi RS3 TT RS 4. 5in S FLO 4in Turbo Inlet Coupler S FLO 4" Coupler: The S FLO 4" Coupler transitions from 4. 5" to 4" to accommodate aftermarket turbo inlet pipes that are 4" in diameter.
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