Ready to order proper offset RH M5's 18 x 9 front and 10 rears.What is ideal offsets for both-- 41f & 45r? Was going to get Pirelli P7000SS 245-40-18f & 275-35-18r,but my friend, who is service mgr. at Ford SVT dealer where my Lightning is serviced, says Pirelli come standard on Saleens they have had out-of-round and other problems. Thought this would be good all weather tire with 300 treadwear rating so it would last? Other tire suggestions for treadwear rating,handling, quiet,etc? Car is 95NA mechanically stock, so I don't want real big, heavy wheels & tires to slow down acceleration any more than necessary. Steve Jarvis,Andi?? All help greatly appreciated!!