Re: Exhaust Diameter/back pressure

[Simon Favre <simon@xxxxxxxxxx>]

My take on this is that it's because "professional" drivers are in the
habit of backing up until they bump into the loading dock. Not good if
your exhaust is hanging out the back. Besides, truck exhausts are
hardly tuned for performance. There may also be another reason for it
on larger gas-burners. They might not want the exhaust pointing back
because of how high up it is. They might not want missiles (a dropped 
valve, etc.) to come shooting out the pipe at following traffic.
Diesels have vertical exhausts way up in the air to allow soot to
dissipate. That's hardly a performance mod I'd try. ;=)

Mitch Wolberg wrote:

>Great answer J. Denis, very informative. Perhaps you can tell me why
>trucks (pu's, vans, etc.) have a right angle bend on the end of their
>exghaust systems so that the exhaust comes out behind one of threar
>wheels, while cars have straight pipes exiting under the rear bumper. Is
>it a torque tuning issue or just for clearance?

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