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      03-17-2013, 06:04 PM   #2
Drives: m3
Join Date: Feb 2013
Location: NYC

Posts: 426
iTrader: (0)

replacing just the filter with a high flow will give you 4-5hp

Replacing the box with MS seems to give you another 3-4hp.

That is why most go with just a filter as even the 3-4 with the MS airbox seems to be hit or miss.

THe stock box is so well designed. Probably the best design I have ever seen on any car including ferraris, lambo, aston and road race cars
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