So I've got a 2004 dsm on buddy club n and 18 inch work emo cr kais 8.5 38 offset. Thinking of going with some 17s for weight saving purposes. I'm looking for a black colored, lightweight rim, concave face. It been awhile since I've been in the tuner scene, any tips or suggestions? Also, I noticed some guys are running 40 series tires with their 17s, doesn't this mess up the speedo?