Does anybody know if the 40 series mufflers that are included in the American Thunder Flows kit is the original 40's or the new quiter ones? Thanks in advance.
American thunder sysem includes two chamber Delta Flows. The Delta's are just as good for flow and still are 2 chamber but have small baffels behind the main ones that help reduce noise. If they are not loud enough for you, consider the rest of the exaust like the H pipe and headers. Even a straight pipe after cat mustang isn't very loud. Well, it's loud all the time but a real built exaust will be quieter at idle but will be much louder at WOT.