Gas engine and Diesel of same specs.Pull the same.

lol black smoke does not equal more power. what it does equal is epa problems which have pretty much fined just about every tuner company doing deletes. my truck barely smokes down the track... guess i have a slow truck. dedicated pulling trucks/tractors are not the ones towing rvs or driving on the road. those trucks billow smoke because they are beyond a street applications fuel ratio and actually at a point where they are cooling the motor somewhat with extra fuel. completely different animals.