Haven't seen a loss but I can tell you with a removed silencer or a modified silencer (mine is modified) you will the notice the RPMs climb quicker. Prior to modifying my silencer, it felt like the engine was just making noise, after modifying it...VRRRRRROOOOMMMM!! I cut 3" off the end of mine and placed a 4" tube in it to extend into the fenderwell.
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1998 Mustang Gt
C&L 80mm
Steeda Underdrives
Steeda Tri-Ax
Magnaflows
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