The WatchDog is digital gauge pack helps develop fuel saving driving habits and provides extra monitoring of truck functions.

Inspired by our popular HDGT, the sleek, intuitive MDGT increases horsepower, torque, and fuel efficiency for tow trucks, tool trucks and medium-duty applications.

For Holset turbo and for Kenworth/Peterbilt. Ceramic coated exhaust manifold typically fits years for Holset Turbo: 3406E 14.6L '95-'98, 3406E 15.8L '95-'98, C-15 14.6L '99-'03, C-16 15.8L '99-'03. Includes turbo studs. Replaces OEM center part# 146-9445.

Ceramic coated exhaust manifold typically fits years '96-'01. Includes turbo studs. Replaces OEM Center Part# 3078323.

Ceramic coated exhaust manifold typically fits years '00-'03. Includes turbo studs. Replace OEM Center Part# 3880199.

Ceramic coated exhaust manifold typically fits years '04-'07. Includes turbo studs. Replaces OEM center part# 3682959.

Ceramic coated exhaust manifold typically fits '08-'10. Includes turbo studs. Replaces OEM center part# 3683789.

For Kenworth/Peterbilt. Ceramic coated exhaust manifold. 3406E 14.6L '95-'98, 15.8L '95-'98, C-15 14.6L '99-'03, C-16 15.8L '99-'03. Includes turbo studs. Replaced OEM center part# 146-9445.

For Kenworth/Peterbilt. Ceramic coated exaust manifold for C-15 15.2L '04.5-'10. Includes turbo studs. Replaces OEM center part# 231-3462.

For Freight Liner/Western Star. Ceramic coated exhaust manifold typically fits years for 3046E 14.6L '95-'98, 15.8L '95-'98, C-15 14.6L '99-'03, C-16 15.8L '99--03. Includes turbo studs. Replaces OEM center part# 150-1914 & 100-5694.

For Freight Liner/ Western Star. Ceramic coated exhaust manifold typically fits years '04.5-'10. Includes turbo studs. Replaces OEM center part# 231-6127.

Ceramic coated exhaust manifold. Replaces OEM center part# 251-4410.

For Ford. Ceramic coated exhaust manifold typically fits years for 3406E 14.6L '95-'98, 3406E 15.8L '95-'98, C-15 14.6L '99-'03, C-16 15.8L '99-'03. Includes turbo studs. Australian application years differ. Replaces OEM center part# 150-1916.

The Bully Dog ECM Tuner is built with simple, easy-to-use performance in mind. This powerful device comes preloaded with the same high performance, dyno-proven tunes as our gauge tuners, except it is designed to be stowed away after installation–simply set it and forget it.

The Heavy Duty Gauge Tuner incorporates Bully Dog's SAE tested and emissions tested diesel engine tuning for both power and economy.