Audi S3 (2015+) 3" Downpipe

Features: Full 304 stainless steel construction Power Gain: Catless version - 15 to 20 whp (without tune) Catted version - 12 to 15 whp (without tune) No tuning required Quality stainless steel braided flex section with interlock liner Comes with stock O2 bung for a seamless installation. Unique oxygen sensor extender bung to assists in preventing CEL (optional) 100% bolts onto OEM exhaust. TIG welded to perfection Options: Metal High Flow Cat Downpipe, ( 3" - 200 cell metal substrate high flow cat to replace the restrictive OEM catalytic converter. Recommended to prevent the "raw" exhaust smell in cabin) O2 Sensor Extender, (not ready for a tune, but want to avoid/prevent Check Engine Light. Our unique stock oxygen sensor extender bung is design to assists in preventing CEL) Extra Wideband Option,(An additional O2 sensor bung with plug welded in place for installation of an aftermarket wideband O2 sensor)