3801614 | CUMMINS BIG CAM 400 UPGRADE TURBO | 3803279

Cummins 855 / Big Cam 400 Turbocharger | Divided Housing Upgrade | New, No Core Required

Available For: Cummins 855, Big Cam 400

This is a stock replacement upgrade for the Cummins 855 and Big Cam 400 — a direct drop-in for the factory turbocharger that mounts to your existing connections with no fabrication or adapters, but performs a step above the unit it replaces. Every turbo ships completely new with no core charge and no core return, so you keep your old unit and skip the wait on a core credit.

The upgrade comes from the divided rear housing, used here in place of the OEM open housing. Splitting the exhaust flow keeps the pulses separated on their way into the turbine wheel rather than letting them collide and wash out, so drive pressure builds sooner and the turbo spools noticeably faster. What you feel behind the wheel is quicker throttle response off idle, less lag when you get into it, and faster recovery when the engine loads up on a grade.