Maybe my truck is a special case, but inside it seems a little loud and I outside I know it is real loud, only when I'm hard on the gas. I think what I'll try first is to add another cherrybomb, and run a tail pipe out the back. Start out cheaply. Its hard to talk exhaust on the internet. My buddy has a flowmaster on his tacoma, he got it for free and it sounds really good, cruising down the road you barely hear it in the truck. I'm not sure what series it is, I'm guessing maybe a 50.
Andrew
