No just stock TR4A paper elements I also have some big velocity stacks for when I want to go fast, zoom zoom. Greg ----- Original Message ----- From: TR6UO at aol.com To: n197tr4 at cs.com ; glemon at neb.rr.com ; 6pack at autox.team.net Sent: Wednesday, November 14, 2012 8:44 PM Subject: Re: [6pack] Stromberg Upgrade? Thanks! Are those K&Ns?