So I do still have this one squeaky noise everytime I hit the gas, but it's way less than it was with my TRZ. MM Boost, as for exhaust, I don't really know about how much quieter it will make yours. I am running the stock DP, so mine is most likely quieter than yours. The biggest difference I noticed was pulling into my garage yesterday. My driveway is basically a mountain, lol, so I have to constantly gas/clutch it to get up while avoid hitting the other car. I noticed it's much quoted, and you don't get that jolt when you give the gas a quick spike. It's nice because it feels taut. Not hard, just well built and solid. The best way to describe it is like driving my moms car. She has an 08 BMW 335i, and when I got in that car, it was amazing. It drives so well. It is taut, but comfortable. It has awesome control, but it's not an animal when your just cruising along. To be honest, even though I'm only 17, and have only driven two years, it is the best car I have ever driven. By far. That's how the mount feels. Taut and controlled, but its there only when you want, and it seems like a better designed mount than the Trz because it is able to hold down the engine while still sustaining driveability and comfort.