The Tom-cat is one of our great ideas for the Mini here at 1320. After lots of testing on our in house Dyno we found that most R53 Cooper S's made the most power with a cat rather than a de-cat. The Tom-cat is a Stock OEM cat with 2 flanges on and a threaded hole for your 02 sensor so it can bolt in to your Janspeed Manifold (or other market manifold). This means you can swap between de-cat and cat by simply bolting and unbolting the short section of pipe. Completely hand TIG welded for a perfect finish and seal. As every car is different we custom make these to fit perfectly so your car will need to come to us for fabricating/fitting so please give us a call to arrange a booking. The Price is for using the cat from your OEM manifold - Please contact us for a price if you would like us to supply a cat.