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Ships within 48 hours · Estimated delivery Aug 16 - Aug 21
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Description
Exhaust Manifold 3901223 for Cummins B-Series 3.9L 4BT3.9 ISBE3.9 QSB3.9 EngineReplacement part number: 3901223 Fit for Cummins Engine: B Series, 3. 9L, 4BT3. 9, ISBE3. 9, QSB3. 9
Replacement part number:
3901223Fit for Cummins Engine: B-Series, 3.9L, 4BT3.9, ISBE3.9, QSB3.9
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4.0 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 5
Flutes and size perfect
Color: Silver
Excellent
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Reviewed in the United States on April 7, 2026
★★★★★ 5
Good quality
Color: Silver
Works perfect for my 2009 jeep 3.8
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Reviewed in the United States on April 25, 2026
★★★★★ 4
Excellent quatity cheap.
Color: Silver
Pervect fit. Heavy duty.
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Reviewed in the United States on January 21, 2026
★★★★★ 3
Very tight fit on 74mm Mobile 1 Filters
Color: Silver
It claims to fit "some" 74mm Mobil 1 filters. It's a fraction too small, but will work if you "force" the tool on the filter.
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Reviewed in the United States on February 25, 2026
★★★★★ 5
Works if you need help. Not a miracle in a bottle.
Size: 1 Count (Pack of 1)
It has worked every time I've used this product. Won't fix a damage catalytic converter but will help you pass the test if your car almost passed.
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Reviewed in the United States on May 28, 2026