Ok Fellas here is the skinny on the mouthpiece exchange. You cannot do it unless you are a vendor. Sorry I know you are not making living off of it, but there are people on here who pay to make a living on it. Yes Timespentsearching does it but, he is also a vendor. The for sale section is for the sale of parts like wheels and tires, tuners, and misc parts for our trucks. That is fine . When you start promoting a service that includes more than a couple of the same part that is what we consider backdoor vending.I am sorry if this makes some peole mad but we do not make the rules we just enforce them.