neither. Go with 3.90s. A jump from 3.42's to 3.73s just isn't worth it, and 4.10s are great, but if you do a lot of hwy travelling your mpg will hurt. 3.90s give you a nice jump in acceleration while still retaining some kind of good hwy mpg.
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Vinnie -
00 SS A4- LQ9/LS3/Stalled/3.42s 1.48/11.10/121 mph<-6spd swap in progress.
13 Silverado Z71- Sold 11/16
99 Z28 M6- -H/C/9in - sold 1/13
99 Silverado Z71- The DD - Sold 7/13
03 CBR 600RR - Sold 8/13
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