Just want to know how much people are paying to have a K&N added onto their insurance?

I phoned up my insurers today who told me it would be and extra £89! I thought this sounded a bit steep so wondered what everyone else is paying.

I'm not really sure i trust the lad that i spoke to cos he asked me to tell him what it was and what it did!

(I'm 25, female, and insured with Direct Line)