I have lowered her quite a bit and had 1 person it the back and it didnt rub at all. Tonight i am gonna have 2 people so i will let you know, but TBH i honestly think it wont rub, as the stretched tyres give u so more room and clearence to play with!
Yes u will need et adapters, with 49et wheels u will need 20mm rear adapters. Which will give u 29et (49-20) which would be cool with a stretched tyre. Ideally the higher the offset the better as then u can play with the offsets to achive the perfect fit.