Performance wise and sound wise yes. The four inch in my opinion sounds better and will flow better.
Bryce
That is what I figured would be the case. I really like the sound of my '06 with straight pipe. Probably too loud for some, and, thankfully, I don't have a complainer for a wifeOo. She actually likes how the truck sounds.

I am going to have to make a trip in my '98 to the big city, since we don't have a muffler shop here that can bend 4" pipe. I know the 12valve won't sound like the '06, but I think it will sound better than it does with the 3" pipe.

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