I just switched from stock exhaust to Screamin' Eagle II slip-ons. The bike is a fuel injected Heritage with a high-flow air cleaner. After the exhaust change, I noticed intermittent popping when decelerating and occasionally when rolling back the throttle between gears. I don't have a Power Commander and am wondering if I will need to buy a stock air box to enrich the fuel mixture. I welcome any feed back from anyone who has been through this before.