I had a 96 1500 with the 4.3 liter V6, and I
installed the Gibson Split Rear Exhaust on there,
and it sounded GOOD, not loud, but just had a nice
sound. I got criticism as well when I ordered the
system, but after I got it home and installed it, all
the criticism was gone and I was getting compliments.
Now, this being a Silverado might be different. Cab
resonance is an issue, I dont know if it would be with
the V6 though.
P.S. You cant make it sound like a V8, but you CAN
make it sound GOOD.
__________________
1996 K2500 Reg Cab Long Box
5.7 Vortec, HD 5-speed manual (NV4500)
LT265/75R16E Toyo Open Country M/T
Hypertech Power Programming (AWESOME)
K&N Air Filter, Flowmaster Exhaust
Centerforce Dual Friction Clutch
Pioneer Head Unit, MTX 200 Watt Amp, MTX 10" Thunder 4500 sub
"To be old and wise you must first be young and stupid" 
