Save 9%
Davico Mfg Exhaust Manifold P/N:663353 Fits: Chevrolet W3500 Tiltmaster, Chevrolet W4500 Tiltmaster, GMC W3500 Forward, GMC W4500 Forward, Isuzu Npr, Isuzu Npr-hd, Workhorse Fastrack Ft1461, Workhorse Fastrack Ft1801, Workhorse W16, Workhorse W18 Image 1
Davico Mfg Exhaust Manifold P/N:663353 Fits: Chevrolet W3500 Tiltmaster, Chevrolet W4500 Tiltmaster, GMC W3500 Forward, GMC W4500 Forward, Isuzu Npr, Isuzu Npr-hd, Workhorse Fastrack Ft1461, Workhorse Fastrack Ft1801, Workhorse W16, Workhorse W18 Image 1
Davico Mfg Exhaust Manifold P/N:663353 Fits: Chevrolet W3500 Tiltmaster, Chevrolet W4500 Tiltmaster, GMC W3500 Forward, GMC W4500 Forward, Isuzu Npr, Isuzu Npr-hd, Workhorse Fastrack Ft1461, Workhorse Fastrack Ft1801, Workhorse W16, Workhorse W18 Image 2
Davico Mfg Exhaust Manifold P/N:663353 Fits: Chevrolet W3500 Tiltmaster, Chevrolet W4500 Tiltmaster, GMC W3500 Forward, GMC W4500 Forward, Isuzu Npr, Isuzu Npr-hd, Workhorse Fastrack Ft1461, Workhorse Fastrack Ft1801, Workhorse W16, Workhorse W18 Image 2
Davico Mfg Exhaust Manifold P/N:663353 Fits: Chevrolet W3500 Tiltmaster, Chevrolet W4500 Tiltmaster, GMC W3500 Forward, GMC W4500 Forward, Isuzu Npr, Isuzu Npr-hd, Workhorse Fastrack Ft1461, Workhorse Fastrack Ft1801, Workhorse W16, Workhorse W18 Image 3
Davico Mfg Exhaust Manifold P/N:663353 Fits: Chevrolet W3500 Tiltmaster, Chevrolet W4500 Tiltmaster, GMC W3500 Forward, GMC W4500 Forward, Isuzu Npr, Isuzu Npr-hd, Workhorse Fastrack Ft1461, Workhorse Fastrack Ft1801, Workhorse W16, Workhorse W18 Image 3
Davico Mfg Exhaust Manifold P/N:663353 Fits: Chevrolet W3500 Tiltmaster, Chevrolet W4500 Tiltmaster, GMC W3500 Forward, GMC W4500 Forward, Isuzu Npr, Isuzu Npr-hd, Workhorse Fastrack Ft1461, Workhorse Fastrack Ft1801, Workhorse W16, Workhorse W18 Image 1
Davico Mfg Exhaust Manifold P/N:663353 Fits: Chevrolet W3500 Tiltmaster, Chevrolet W4500 Tiltmaster, GMC W3500 Forward, GMC W4500 Forward, Isuzu Npr, Isuzu Npr-hd, Workhorse Fastrack Ft1461, Workhorse Fastrack Ft1801, Workhorse W16, Workhorse W18 Image 2
Davico Mfg Exhaust Manifold P/N:663353 Fits: Chevrolet W3500 Tiltmaster, Chevrolet W4500 Tiltmaster, GMC W3500 Forward, GMC W4500 Forward, Isuzu Npr, Isuzu Npr-hd, Workhorse Fastrack Ft1461, Workhorse Fastrack Ft1801, Workhorse W16, Workhorse W18 Image 3

Davico Exhaust Manifold P/N:663353

$130.86 $143.95 /
Subscription -
  • Quickly and easily replace leaking or corroded OEM exhaust manifold
  • Exact fit for a fast and straightforward install
  • Fits Chevrolet W3500 Tiltmaster, Chevrolet W4500 Tiltmaster, GMC W3500 Forward, GMC W4500 Forward, Isuzu NPR, Isuzu NPR-HD, Workhorse Fastrack FT1461, Workhorse Fastrack FT1801, Workhorse W16, and Workhorse W18
  • Manufactured in the USA
Checking Fitment...
Determining if this part fits your vehicle
Perfect Fit Confirmed!
This Product Does Not Fit
No Fitment Selected
Add your vehicle to verify product compatibility
Sold out

Lightning Fast Shipping

Premium Quality

Get Running Again

Install Without Guesswork

All of our OEM replacement converters, mufflers, manifolds, and tubing are built to factory specs - all flanges, brackets, and sensor ports line up. No cutting, welding, or modifying.

Get Back On The Road

Fix leaks, resolve error codes, and pass emissions standards so you can get your vehicle back on the road.

Built to Last

All of the products we offer are made from high-grade materials, and most of them are Made In the USA too.

Recently viewed