I had the 3" inlet / dual 2.5" outlets on my S-10 with the 4.3 before I got the silverado. It sounded really good, I was totally suprised. At idle and low RPM's it definitely sounded mean. If it was sitting there idling you would think it was a V8, I had more than a few people ask me if I did the engine swap myself.

I would pop the hood and show them the V6 and they would be suprised. Really liked that truck...