Changing wheels and tires back and fourth
 

Ok, most all of the time I'll have my after market 19's on lowered with coilovers that have been cornered balanced and aligned.

My question is (hope it's not a dumb one) if I was to change back to my stock wheels (18's) and tires to goof off in doing doughnuts, burnouts, and slideways to learn my car little better, would my specs be thrown off when I go BACK with the 19's? I just want take less abuse on my RE 11's for now being there brand new. I would only put the stockers on to goof off and not ride around DD or anything.

No, but you might break some other mechanical parts doing stupid $hits like burnouts

OP- no real issue. just remember the car will handle differently between your meaty aftermarkets and stock 18's.

Your camber may change if you go from no spacers to using some, or vice versa. But likely negligible difference for goofing off. However your corner balancing will be unaffected.

Thanks for the comments. You all made great points and will be taken in. I just want some basic finesse being I've been out of the loop for three years.