Exhaust› Headers, Manifolds and Components

Bully Dog

Bully Dog Big Rig Exhaust Manifold Ceramic Coated for Cummins ISX (3683789 OEM) ISX 08- 11 DPF Cummins ISX

$2,265.00

SKU: B00J 85103

In Stock
In Stock
Ships by Jun 19
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The Bully Dog 85103 is a ceramic-coated exhaust manifold for 2008-2011 Cummins ISX DPF engines, designed to increase exhaust flow, reduce turbo lag, and lower EGTs for heavy-duty trucks including Peterbilt, Kenworth, and Freightliner. It replaces OEM part 3683789.

Fitment

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Specifications

BrandBully Dog
Part NumberB00J 85103

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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