..on a 88 'vert? If so what do I do with it when removing the stock airbox? Putting K&N filter with adapter plate, can I just get a small filter for it? Thanks.

 

ye sbuy one at autozone for $9.00. But make sure you make a cold air box for that filter or you are going to end up loosing power not gaining it....

 

the K&N FIPK for the s4 FC already has accomodations for the air pump inlet. If you are getting a hIGGItrix or HKS adapter (or an eBay adapter) you will need a small breather-type filter for the airpump. You can put it on the hose or directly on the pump (mine is directly on the pump).

 

Thanks, anyone know what size this breather for the airpump should be, 3/8" maybe?

 

anybody know the ID size of the flange for the airpump? Thanks