HA HA protect the envoroment by burning twice as much fuel the only thing the dpf protects is the proffits of the oil companys. I belive one day there may be a good system but today is not that day. IMO
Diesels are quiet to begin with. Plus, the turbo turbine housing could actually be considered a muffler in itself. By the time the exh plays around in the turbine housing and spins the wheel, it has knocked alot of noise off. Alot of turbo (gas) cars don't even run mufflers. The turbo eats alot of sound pulses.
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