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A high-quality y-pipe solution for all. Just bought an aftermarket or STI TMIC that requires an STI y-pipe to fit? Want to replace your chewed up and leaking couplers? Maybe you're just looking to freshen up your engine bay with a touch of GrimmSpeed style. Well, there's something for everybody with the GrimmSpeed Y-Pipe Kit. Quick Specs One-Piece Aluminum Casting - Precise fit and smooth flow without distortion Thick Flanges - Prevent heat and vibration from cracking casting Machined Flanges - Ensures a perfect fit, leak-free seal, every time 5-Ply High-Grade Silicone Couplers - Smooth interior to maximize airflow and minimize restriction Heat Resistant Reinforcement - Couplers keep their shape, even at high boost levels Stainless Steel High-Torque Clamps - Rust-proof construction with smooth operation Black Zinc Coated Hardware - Ditch those nasty OEM fasteners