I installed a Mini and deleted a few months ago, along with a CAI. My question is, I've been running the HD300 tune since I've had the tuner on. Should I back down to the stock or low power tune every couple of months to get the EGR running again and flush it out? I'm not too sure on how that works, but I'm starting to have some issues with grey smoke and I don't know if maybe it's a clogged EGR or something like that. Thanks.