Will this fit a 2003 silveraldo?

This muffler fit my truck , it has a 3 inch exhaust pipe. Your 2003 Silverado may have a 2 -1/2 inch exhaust ,the company still makes this in 2-1/2 inch.

does this muffler come in 2.5" inlet/outlet

I am sure it does. Most mufflers come in at least 2", 2.5" and 3".

Currently, i am running dual vibrant tpv 1058 3.0 exhaust with x-pipe and want something quiet, will this quieter? running an ls2 6.0 v8 in the car.

I am not familiar with the Vibrant muffler but I think it is quite loud. I went back to thee dynomax from Hooker aero chambers due to noise. The dynomax is much quieter and no drone inside the car. I have run a lot of different mufflers over the years on 2.5 inch exhaust and on my 3" these were very quiet. Nice to cruise with. I have a 383 small block in a nova with an xpipe . The 3" exhaust runs from the headers back over the rear axle and dumps behind the rear tires like the early camaros did. Motor make 470 HP and 460 tq so it moves some air. I think these mufflers will be much quiter than the vibrants. If you want to really quiet it down and can afford a SLIGHT loss of HP install the 2 .5" mufflers with the reducers on each side of the muffler.

Brand	Dynomax
Item dimensions L x W x H	52.7 x 26 x 12.4 Centimeters
Vehicle Service Type	Car
Shape	Oval
UPC	086387177443
Manufacturer	Tenneco (Dynomax, Walker, Thrush)
Global Trade Identification Number	00086387177443
Model	17744
Product Dimensions	52.71 x 26.04 x 12.4 cm; 4.99 kg
Item model number	17744
Manufacturer Part Number	17744
OEM Part Number	17744
Assembly Required	No
Item Weight	4 kg 990 g

17744 Super Turbo Muffler

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