Noise Filters

[Road]

I am new to this radio deal, and I have bought a jam-up radio from RA, doing a great job. I do have engine noise that I would like to filter out. I need to know where I can buy a filter, what kind, and where to install it. Any info will be greatly appreciated.

[PW(P-Dub)]

I just got one of these PM for eBay link