I changed my RFTs on my 135i for Goodyear eagle F1's 10mm wider than stock both front and back, and in my opinion, it does make the car better, but not by much, eveything is kind of 10-15% better with non-RFT, except wet grip, which is transformed ten fold.
theres my 2p
oh and my car is for sale now, somebody buy it!
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