In my (and that of many others) opinion, you're not going to get a good sound outa any v6, unless you have a newer nissan 3.5. Magnaflow makes high flow universal cats, which aren't too expensive, but their mufflers are spendy. I've heard of walker but know nothing about them. You could always buy longer mufflers too.
I guess by good sound I just don't want my truck to sound like a bumble bee in a coffee can. I like the way it sounds now, its just too fricken loud
