Mine is a 2011 Preminum, Pony Package, Automatic transmission. I have the 'foam' and have never heard any kind of ping sounds coming from my engine.
'Little Red'. 2011 V-6 Mustang. Automatic <acronym title="transmission">Trans
</acronym>. C&L C.A.I. Ceramic Coated BBK Long Tube Headers and Catted Shorty X-Pipe. Magnaflow Street Series Axle Backs. 3.73 rear gears. GT 500 Lower Control Arms. JLT Catch Can. Axle Exchange Aluminum Drive Shaft. Steeda Watts Link. Several more mods...1991 F150 4X4 61,000 miles. Wifes car, 2014 Ford Edge Limited.