Well my cruiser will not pass smog do to an issue with my cats. And instead of just replacing those I am wanting to do a new system, what have you guys been running? I am wanting to only have one pipe running to the tail pipe, because I don't think two is efficient. I am not looking for a loud system, just maybe a little throatier than stock. Also if any of you have done your own diy exhaust please post that up to.