03-14-2005, 01:34 AM
I'm not sure what the SPI crankcase breather tube looks like or how it's connected to the air box (stock) but I know on the Zetec intakes, if you put on a cone filter and remove the box you DO need to put on a breather filter on the crankcase breather tube so as for the SPI, yes you will need to do that also.