I have a friend who I dropped an OS .18 CV-RX into his RS4 3 . You can get it to fit with some creative careful trimming. I gotta tell ya I don't know if there is anything you can do to wrestle some control back into that car with that engine in it. He is all over the place with it body or not. We have tried adjusting shock preload, front/rear balance, toe and camber, foam and rubber tires, etc,etc.. I think the combination of being more rear heavy with too much power. He breaks loose constantly plus the evo needs alot of upgrades to get it even close to racing spec and that may or may not help in handling. I told him to go no larger than .15 preferably a .12. But he listened to the hobby shop guy and not his experienced friend. Good luck.