BMW 135i SuperSprint Metallic Cat System
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After the down pipes' outlet flanges, the cross section shrinks down from 65mm to 60mm, (still larger than the factory 57mm tubing size) and it is maintained constant all the way to the tail tips. Once again there are no crushed sections in the tubing as with the factory system for clearance. In place of the factory quad cat design, Supersprint uses 2 high volume / high flow 100 cpsi metallic race cats. These are placed further away from the engine for the lowest restriction and the best results. Legal only for racing vehicles which may never be used upon a highway. Not applicable or intended for street or highway use.