Hi you guys, I'm the friend that Seraphitia102 is talking about. I own the 240sx. I plan to put 18x9 Saleen wheels on my 240 because I love mustang wheels. I do own a mustang my self so that why I love them. Now I'm not 100% what size tires I need but I think 225/40/ZR18's will fit. And yes 18X9 fit on a 240sx. here is pic of a 240sx with Mustang cobra wheels: 18X9 +26 with 225/40/ZR18 all around (not my car).
If I do get 245/40/zr18 will my speedo be off? Right now I have 215/40/ZR17s.