- ATR cold air intake airbox with K&N filter - Aluminum airbox for ATR cold air system, designed to be used as part of their cold air setup. 14" K&N filter substituted at the factory for the ATR unit. Filter is not cleaned. Will not fit with front mount intercoolers or many stretch intercoolers due to their piping or scoop locations. - $50 (add $10 to have filter cleaned and oiled before unit is shipped)