- Diesel Converters are not exempted by CARB for on-road applications. These converters are specially formulated to control diesel exhaust. 54100 Diesel 93000 Diesel 95000 Diesel 54100 DIESEL DIESEL SHORT ROUND UNIVERSAL The 54100 Diesel converters is designed for small diesel engines. IN/OUT PART# 2" 54104D CONTINUES > > Universal Converters || California Compliant Converters || Diesel Converters Ford Truck Converters || Mirror Finish Converters || Selecting The Proper Universal Converter