Quoted from Westsiderkg:

As an audiophile, I decided to also upgrade my MMRRE factory Pyle speakers to Kicker 47KSC3504 speakers.
WOW, what a difference for $70!!! Easy installation. Fyi, they're currently on sale at Crutchfield.
Anyone else who finds the Pyle speakers less than adequate should consider this. The callouts are much clearer imho with the Kickers. Direct drop in.
Looking back, I think the left Pyle speaker was loosing integrity, it was distorting certain callouts which I originally thought were vibrations.
Great upgrade and really makes the game more enjoyable.