What breather filter should I use on my secondary air intake pipe? And how does it connect up. The pipe has a strange clip on it. Thanks

Measure the ID of the end of the pipe, go to local car factors for the smallest breather filter which will prob be approx 9mm bot check the OD as with mine until I remove my SAI I pushed the breather up inside the pipe without cutting anything off then used good old black insulation tape to make a neat and prevent it falling out. Some breathers may have a slightly too fat neck that you can just shave down with a Stanley blade.

I've got a SAI removal kit on the way so it'll all be off in the next few weeks.

Ok thanks. Didn't think about putting it inside and taping it up lol. Is any old one from ebay ok or should I get a k&n?