exhaust 2000 5.3 silverado

[emeryf86]

What's the best exhaust for performance and will it help my mpg 2000 Silverado 5.3

 

[kstruckcountry]

Factory performs fine. You may gain some mpg <.5 with a straight through muffler (Magnaflow or similar). It's mainly for sound.

[mstevens]

i put a flowmaster 40 series cat back on my 2000 sierra 5.3 and i love the sound, really couldnt tell you mpg gain/ loss because ive never really kept track, but it looks/ sounds awesome

 

 

[rudyb]

I had a single in/dual out Flowmaster 40 delta flow and it was awful. In
town it sounded badass. 55mph+ was excruciating. The resonance in the cab was
just obnoxious. Mine was also dumped immediately after the muffler, instead of
running it out the back or side. The day I had it replaced, was probably one of
the happiest days of my life. I had it replaced with a single in/single out 14”
MagnaFlow using 3” pipe dumped just after the back axle. Personally, I think it’s
just right. It’s nice and quiet on the highway, while still providing a manly
rumble around town. A simple exhaust mod isn’t going to make a significant
change to fuel economy or horsepower so don’t overspend.

 

Also, as indicated by the water on the floor, I am aware that I currently have a small exhaust leak. No need to inform me.

 

[jblakeney]

I had a flowmaster system on my truck that rusted through. A few years ago I put a Borla system on my truck. Never noticed much of a change in MPGs...... Just sounds better.