Definitely subscribed! I've been wondering what it would take to mount 18x10 in the rear on an 818. I'm working on buying a house for now (wife says it's more important or something like that haha) but the first chance I have I'm snatching up an 818C and want to build to around the same +/-400rwhp that you're looking for. I know the subbie engines can make that easily and that the transmissions can be built to handle it but I was REALLY worried about traction with the rear tire widths that I've been seeing. I was thinking along the same lines with the fender flares but wasn't really sure how to go about it.