Features F1-style 4 into 1 merge collector for reduced turbulence which creates more horsepower and torque T304 stainless steel heavy duty tubing, TIG welded and natural finish. Tubing wall thickness is increased to 1.5mm. Includes O2 (lambda) sensor ports just like the original down pipe configuration includes high quality 200 cpsi metallic Euro 5 catalytic converter. Improvement is approximately 12 hp. The header includes a flexible joint for any slight adjustments that may be necessary. The kit comes complete with hardware and gaskets. Fitment 2002-2006 MINI Cooper Hatchback 2-Door R50 2002-2006 MINI Cooper S Hatchback 2-Door R53 2005-2008 MINI Cooper Convertible R52 2005-2008 MINI Cooper JCW Convertible R52 2005-2008 MINI Cooper S Convertible R52