So I was forced to get exhaust for the 97. My muffler actually just cracked in half so I was FORCED to go spend the money on the 4" downpipe and 5" out the back. As soon as I hit the highway, a Duramax with sticker's all over it wanted to play. Me and Shelby (bombed 24V cummins) lined up 3 wide on the highway and let him have it! It was horrible, but the guy was cool and gave us a wave when it was over. It really feels like the exhaust helped in lockup (OD), but seems to be making just enough more power to be hurting my stock transmission a bit more in 1-2-3-4 shifts. Getting close to the DTT!!