Im just thinkin.... if you damaged your bumper practicing does that mean your gonna stop drifting now? Because to me it wouldnt make much sense spending money on a conversion if your gonna keep practicing which in the highest possibility you will have another little slip up. I'm not trying to bash you im just trying to save you money. But do whatever you want man, its your car.
P.S. - They do contruction at unfinnished housing developments so there will be deposits of sand and dirt on the streets which can be very slippery and cause unpredictable tire slips.