RT,

I am not trying to be combative here. I will take your word for the increase on your truck, but this is only telling me that your truck had and EXTREMELY poorly designed exhaust system.

The ONLY gain that could be derived without somehow injecting more fuel would be a drastic decrease in pumping losses.

As psfred indicates, the MB system is not too bad, any power increase would be totally insignificant without fuel system modifications.

REMEMBER, on a diesel engine you regulate power by regulating the amount of fuel injected into the cylinder. Fuel air ratios are acceptable on a VERY broad range.

In a GAS engine, the fuel is mixed with the air before being drawn into the cylinder. This means ANYTHING you do to make the engine breath better increases power within certain acceptable parameters. A diesel in contrast, draws ONLY air into the cylinder, the fuel quantity is determined by the fuel system alone.

Have a great day,