Stock 15" on the Camry V6 LE is 205/65/15 Stock 16" on the Camry V6 SE is 215/60/16
The 16" tire is considerable bigger than the 15" (about 1% too big), but I highly, highly doubt Toyota recalibrates the speedo.
If you want to go a safer size (and a more aggressive and better handling tire), go for 215/55/16.
15" wheels. Will I need to have my speedo calibrated for the bigger size? Is this something my dealer can do?