Actually, I think 94 was the first year. I thought the first two years were not lowered but had bigger sway bars & such. I have heard from many SS owners that state that they have an extra 10 HP, but I have never seen anything confirming this, such as a factory window sticker or Car & driver issue, etc. Not to say it isnt fact, I am just saying I have only heard it from S-sites. Really a ZQ8 is the same truck, unless you look at the glove box....but no one does. The reason everyone wants the ZQ8 wheels is they look so better than the weak xtreme wheels. The xtreme wheel are 16 inch at the lip but then taper, which makes them look like 14" wheels to me.