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unparalleled sound and performance TIG welded by hand classic reverse cone megaphone 100% Stainless steel construction with welded end caps and spiral wound Stainless steel perforated inner core stepped Headers for immediate power gain heat shields included two comp-s 2-1 full systems: Stainless 2-1 cone system complete w/carbon fiber end cap, or welded megaphone Gen II end cap stepped Headers offer substantial power increase 2-1 system increases torque significantly exhaust system accommodates both stock (12mm) O2 sensors and aftermarket wide band (18mm) sensors for versatility in tuning.