This Tubi Style Exhaust System is a perfect match to the characteristics of the Cayman/Boxster. While it delivers a much more muscular and aggressive exhaust sound, the Tubi system also retains the qualities that make the Cayman and Boxster so enjoyable, with no excessive cabin noise or droning. The dual polished mufflers peeking out from behind the rear bumber feature Tubi's signature free flowing design, producing gains of approximately 15-20hp. The tubi system also eliminates the highly restrictive catalytic converters, allowing greatly improved exhaust flow.