Quote:
Originally Posted by HP Autosport
If you can find them cheap. You will likely gain about 10 hp by the switch. The alternative is just to save the money and put it towards a cat-back exhaust, intake of a proper software flash for the car.
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It actually says here on page 16
http://www.1addicts.com/forums/attac...2&d=1396203865
that the 1-series M coupe uses the same primary cats as a Z4 35is. The reason the part number was changed, it says, was because of a different flange positioning.
BTW the part numbers for the primary cats on the Z4 35is and 35i are the same. So unless the 306hp N54 Z4 uses cats with higher flow compared to the 306hp N54 135i then they are basically the same cats. The N54 335i and N54 335is also use the same primary cats btw.