Newer model 5.3's with magnaflow?  Discussion in 'Chevy Truck
Accessories' started by Kman1022, May 27, 2010.    1. Kman1022
Kman1022 New Member      I had an 04 and put a single magnaflow
muffler to dual tips and it sounded amazing. Low tones and not
too obnoxious. I'm thinking about going the same route with my
2010 5.3. My buddy, a GM mechanic, works at the dealership I
bought the truck from. So I got the keys and went to say hello.
I started telling him my plans for the truck. As I'm mentioning
the magnaflow plans another mechanic walks over and asks if my
truck has(forgive my stupidity, I'm not sure of the correct
terms for this) the technology where the engine shuts down to 4
cyl on the highway to conserve fuel. I say yes and he says don't
buy an exhaust cause it's gonna sound like total crap on the
highway.     Can anyone attest to this or have any opinion at
all on this subject?      Thanks guys   2. BigBlueLB756
BigBlueLB756 Rockstar 100 Posts      Unless you buy Corsa or
Borla or have the