Will this fit on a 03 gmc envoy with the 4.2 in it?

Probably not, most likely you have to have the right length of tube and the rubber hoses to connect everything,I would type in the search 03 gmc envoy 4.2L coldair intake and see what comes up, hope that helps.

Fit a 2500dh 6.6 duramax?

Not for the diesel applications

Anybody know the k&n replacement filter number for 2003 silverado 5.3??

I know S&B filters KF-1000 & KF-1042 fits straight to MAF

I would like a second filter so when i clean one i can put the other in and go? where do i get one

I would definitely upgrade the filter, these ate cheap and aren't meant to be cleaned. If you measure the inlet hole you can find this filter for any brand.

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MOOSUN 4 inch Cold Air Intake Black Tube + Heat Shield for 1999-2006 GMC/Chevy V8 4.8L/5.3L/6.0L Silverado 1500/2500/3500 Black

MOOSUN 4 inch Cold Air Intake Black Tube + Heat Shield for 1999-2006 GMC/Chevy V8 4.8L/5.3L/6.0L Silverado 1500/2500/3500 Black

Product ID: 180126183

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Details

Brand
MOOSUN
Product Dimensions
14.96"L x x
OEM Part Number
MS-99-06-BB
Shape
Oblong
Manufacturer
MOOSUN

📏Compact 4-inch intake tube for optimized airflow

🔥Durable carbon-black powder-coated heat shield

🛠️Precision-fit for 1999-2006 GMC/Chevy V8 engines

Description

🔥 Elevate your Silverado’s breathability — because your V8 deserves the freshest air!

BUILT TO LAST - Robust materials and finish resist corrosion and wear, keeping your performance edge season after season.
HEAT SHIELD MASTERY - Steel heat shield protects intake air from engine heat, preserving cooler, denser air for peak combustion.
TAILORED POWER BOOST - Specifically engineered for 4.8L, 5.3L, and 6.0L V8 Silverado models to maximize cold air intake efficiency.
SLEEK STEALTHY DESIGN - Matte black carbon powder coating ensures your engine bay looks as sharp as your ride performs.
PLUG AND PLAY INSTALLATION - Precision dimensions (14.96"L x 11.02"W x 5.91"H) guarantee a hassle-free upgrade with OEM-level fitment.

The MOOSUN 4-inch Cold Air Intake kit is a precision-engineered upgrade for 1999-2006 GMC and Chevy Silverado V8 engines (4.8L, 5.3L, 6.0L). Featuring a carbon-black powder-coated intake tube and steel heat shield, it enhances airflow while protecting against heat soak, delivering improved engine efficiency and a sleek, durable finish designed to last.

Specifications

Brand	MOOSUN
Product Dimensions	14.96"L x 11.02"W x 5.91"H
OEM Part Number	MS-99-06-BB
Shape	Oblong
Manufacturer	MOOSUN
UPC	303277078674
Item Weight	7.89 pounds
Item model number	MS-99-06-BB
Manufacturer Part Number	MS-99-06-BB
Special Features	【unique】The kit includes a intake tube and steel heat shield that features a durable carbon-black powder coating for long lasting good looks.

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