I've noticed a few people running a silverado ss exhaust on their non-ss trucks. I was wondering if these flow better than aftermarket cat-back exhaust systems? Also, does anybody know the part number for this?

 

A lot of the Silverado SS guys are getting rid of the stock exhaust because it is restrictive. Somebody over at silveradoss.com cut open a stock muffler and found that the two 3" pipes going in neck down to a single 2" tube inside the muffler!
I'd say look at aftermarket exhaust systems...

 

ask y2ksilverado i think he is running one.

 

Yep, I've got one on my non SS truck. I've did heard that it does neck down inside (according for Flo-Pro exhaust) but I did notice a nice gain in power. Since it's designed for the HO 6.0L that puts out 345 HP & 385 TQ, I figured it would flow well enough for my 5.3L engine. It's not loud, I think it's quieter on my truck because the 5.3L is a smaller engine and it has less compression than the SS's 6.0L. It has nice quiet rumble to it but I like it, I don't like loud. For me it's a nice fit, the only thing I don't like is that it's a single pipe, I like the turn down dual tailpipe look like on the Crown Vic cop cars.
Jim

 

My silvSS is still running the stock myffler and is making some pretty good power. I love the exterior sound and the interior quiet. Unfortunately, I think there will be a better muffler performance wise for me. I may go with a Magnaflow and try and keep the stock tip. I want the sleeper look / sound.