K&N Flat vs Cone Filter M135i

[M135i]

bump

 

[Quick///M]

Hi, sorry for the hi-jack but can anyone suggest a filter for the N55 135i DCT? Would the filter be a simple replacement for the oem one? Will bmw be able to detect that an after-market filter was fitted? Will the filter make any difference to the spool? (I'm a sucker for the turbo sound:rollsmile

I have been researching apparently no difference is the general consensus