Bully Dog’s Big Rig Premium Exhaust manifolds are the fasted flowing exhaust manifolds in the industry. REALLY! Designed to provide quicker turbo spool, higher power output, and more fuel economy with the two main goals to maximize airflow and eliminate any and all known or possible failure points in the existing stock parts, the final result will truly blow you away.
Reduced turbo lag, Lower EGT’s 80-100 F, Increase fuel mileage 0.2-0.3 mpg, 28-32 hp increase.
No leaks, No warping, No cracking. Thicker manifold flanges and exhaust manifold walls. 100% Made In The USA.
Capitalize on the fuel savings and horsepower gains with our exhaust manifold. Don’t take the chance of being stranded on the road from a failed OEM exhaust manifold.
Available For: ISX ‘03.5-’07 EGR Cummins ISX
Replaces OEM Part 3682959