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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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: 394151577

Details

Brand
MOOSUN
Fit Type
Vehicle Fit
OEM Part Number
MS-99-06-BB
Product Dimensions
38L x 28W x
Product Grade
Performance

⚙️4-inch high-flow aluminum intake tube

❄️Heat shield for cooler air intake

🛡️Durable multilayer powder coating

Description

❄️ Unleash your V8’s true roar with cooler, cleaner air!

ENGINE OPTIMIZED COLD AIRFLOW - Flared 4-inch tube draws in denser, colder air for max combustion efficiency.
REUSABLE HIGH EFFICIENCY FILTER - 98%+ filtration with washable cotton filter, saving you money and hassle every 100k miles.
BUILT TO LAST RESIST CORROSION - Multilayer carbon black powder coating ensures long-term durability and sleek looks.
PRECISION FIT FOR V 8 POWERHOUSES - Custom fit for 1999-2006 Silverado, Sierra, Yukon, Escalade & more — no guesswork.
AGGRESSIVE SOUND MEETS DAILY DRIVE - Deep intake roar under throttle, yet smooth and quiet cruising—performance you can feel and hear.

This 4-inch cold air intake system features a durable multilayer powder-coated aluminum tube and a steel heat shield to isolate the air filter from engine heat, delivering cooler, denser air for improved horsepower and torque. Designed specifically for 1999-2006 GMC and Chevy V8 trucks and SUVs, it includes a reusable high-efficiency cotton filter with over 98% filtration efficiency. The system balances aggressive intake sound with refined cruising comfort, making it a perfect upgrade for enthusiasts seeking reliable performance gains and a bold engine note.

Specifications

ASIN	B082VH33Y4
Automotive Fit Type	Vehicle Specific Fit
Brand Name	MOOSUN
Country of Origin	USA
Customer Reviews	4.4 4.4 out of 5 stars (1,458)
Fit Type	Vehicle Specific Fit
Item Dimensions L x W x H	38L x 28W x 15H Centimeters
Item Weight	7.89 Pounds
Manufacturer	MOOSUN
Manufacturer Part Number	MS-99-06-BB
Model	MS-99-06-BB
Number of Packs	1
OEM Equivalent Part Number	MS-99-06-BB
Product Grade	Performance Part
UPC	303277078674
Unit Count	1.0 Count

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