I know this has been discussed before...sorry!
Having bought my Pipercross Vector induction kit and installed it I finally decided to ring the dealer and ask them what, if any are the consequences of purchasing an after market airfilter on my warranty...
Apparently as long as I take the airfilter off before any warranty work (if needed, hopefully not!!) there will be no issues, although I still worry about the occasions when MINI gives up the ghost and needs rescued (not able to get home to swap filters
)
The dealer actually told me to 'go for it, as she will sound sweet'
Oh and she does sound sweet oh sooooo sweet
Performance air filter and warranty 
