Quote:
Originally Posted by nate82
I just picked up an '11 335d. A few of my friends have diesel trucks and have deleted the mufflers on them and have measurable hp and torque gains. Has anyone done this on a 335d or X5d and with any gains? What do you think?
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Most of the back pressure on the d is further upstream around the DPF. You cannot remove the DPF. So - if you remove the mufflers, you might succeed in making your car noisier, but probably won't succeed in gaining much power.