1 XL â or EXL, Exploration Licence (United Kingdom), a type of onshore licence issued between the First Onshore Licensing Round (1986) and the Sixth (1992). 2  Xln â Crystalline (minerals). 3  XLPE-Cross-linked Polyethylene. 4  XMAC â Cross-Multipole Array Acoustic log.
When the frequency approaches 120 CPM (2 Hz), occupants perceive the ride as harsh. Consequently, the suspension of the average family sedan will have a natural frequency of about 60 to 90 CPM. A high-performance sports car will have a stiffer suspension with a natural frequency of about 120 to 150 CPM (2 to 2.5 Hz). Originally, human sensitivity to ride frequency was believed to be associated with the natural oscillations of an adult human body during a walking gait.
Report Abuse. trust me on this: You dont want a car as loud as possible. Cars with straight headers are incredibly painfully loud. Not something you want to drive around with on any kind of a regular basis. the loudest setup is a catless straight pipe(s).No muffler, no silencer, no resonator. Just horribly loud.eport Abuse. trust me on this: You dont want a car as loud as possible. Cars with straight headers are incredibly painfully loud. Not something you want to drive around with on any kind of a regular basis. the loudest setup is a catless straight pipe(s). No muffler, no silencer, no resonator.