The APR Turbo Inlet Pipe is an easy-to-install bolt-on upgrade that eliminates a restriction before the turbocharger. Unlike fabricated units on the market today, ours is cast from aluminum, allowing for an organically shaped inlet that transitions gradually over a large distance. Such a design promotes better flow rather than abruptly reducing at the turbocharger's inlet like other units. It's larger than stock throughout, removes a large internal restriction at the PCV inlet, and outflows the factory unit allowing the turbocharger to operate more efficiently. We fully assemble each unit with a billet securing arm, billet PCV bung and new o-ring. The inlet and outlet are CNC-machined to control tolerances and ensure snug and secure connections. This upgrade is recommended at all stages utilizing an IHI IS12, IS20 or IS38 turbocharger! Fits Audi A3 15-20, A3 Quattro 15-20, Q3 19-23, S3 15-20, TT 16-23, TTS Quattro 16-23; VW Arteon 19-21, Atlas 18-23, Atlas Cross Sport 20-23, Golf 15-18, Golf Alltrack 17-19, Golf R 15-19, Golf SportWagen 15-19, GTI 15-21, Jetta 19-23