Replies to post #104105 on Aero Performance Products Inc (fka AERP)

[EarnestDD]

Here is what the article says on mufflers.

NO MORE MUFFLERS

Despite all the changes centering on NOx reduction, the biggest challenge for '07 was dealing with particulate matter (PM). All of the manufacturers found it necessary to go with an aftertreatment device that includes a diesel particulate filter.

"The muffler as we know and love it today is gone," says David McKenna, powertrain products marketing manager, Mack Trucks Inc. "In its place is a diesel particulate filter."