Perfect Sound Tube Plug (at the firewall)
I installed a JLT CAI and subsequently removed the sound tube piping. I plugged the hole at the firewall with a "Closed PCV System Type" Oil Filler Cap (rubber, manufactured by Stant). Part #11072; has "OIL" stamped on front face of cap. I think it was less than $2 with tax. A little bit of grease and some grunting when I pushed it in, plugged her hole nice and tight...don't have permissions to post attachments...not sure why. I have photos...help!