Hardin Marine has just introduced their latest performance
mufflers, the XPM525. These new silencers address the J-2005 SAE test that
is now the standard in many states including California. In a recent
independent test, these silencers showed a 12.2-decibel noise reduction at
idle speed when mounted on the Mercury 525 engine package. This brought the
test boat down to 88db passing the stringent California noise ordinance
enacted this year. When installed on a test boat equipped with the 496 engine package, the mufflers brought it down to 88db.
The XPM525’s are constructed entirely from 316L stainless steel in order to
provide the maximum corrosion resistance available in saltwater
applications. These mufflers do not have any moving parts or packing to wear
out. The significant sound reduction is accomplished with a 5-inch 2-phase
expansion chamber in conjunction with a center sound wave baffle. The unique
down-turned design helps to keep spray and carbon residue from accumulating
on the boats transom. Heavy-duty external exhaust flappers are included to
prevent any chance of water ingestion through the exhaust system.
Installation is simple. The XPM525 muffler system is designed to clamp onto
any 4” O.D. tailpipe or exhaust tip using an integral stainless band clamp
and a 1/8” set screw for added security. The mufflers are 12-1/2” in overall
length.
The meticulous hand polished finish bring these mufflers to a show quality
shine making them a beautiful addition to any boat while maintaining their
necessary functionality. Sold in pairs.