I'll let others speak to the top end speed and quietness as I'd only had my SRT 5 days before it was in an accident. It's been in the shop for 2 months now. Anyway, if you get another chance, try launching it from a dead stop. I did that a couple times when I was test driving, then again after I bought mine. It's just plain awesome from a complete stop. It's, no-kidding push you back in your seat ,fast. Don't give up on it just yet.