17" setup on a West Coast Cobra. 245/45R17 tires on the front replaced old, aged-out 245/60R15 BFG TAs. They're 0.9" smaller in diameter and the new wheels pulled them into the wheel wells, allowing me to adjust the coilovers and drop the front end enough so that I needed a lower profile saddle on the floor jack.
On the rear, the new 275/40R17 tires are about 0.2" lower than the old 275/50R15 BFGs. Again, the new wheels pulled them into the wheel wells for a much better appearance, IMO.
The front ended up about 1" lower than before, and the rear just a smidge lower. Overall, the stance is much improved - though now I need to pay even more attention to speed bumps and other road obstructions.
WCCs are already so different from the original Cobras that "looking like a hot rod" is the least of my worries. LOL
