Umm 90 dB @ 1 m @ 1 W speaker at 50 W at 1 m = 110.8 dB from a pair.
Thats plenty loud.
And I highly doubt the stock speakers with no excursion can reproduce even 100 Hz at that sound level.
No speaker without a fairly large voice coil can handle 150 watts RMS.
I'm not going to be putting the full 150 on 24/7. They do fine for me and sound fine, just adding power to have there as reserve. Gain will be set accordingly.
2001 Grand Prix GT Sedan Silver :: Sony CD-GT54UIW :: Clarion EQS746
2x Audioque SDC2.5 12" D4 + Audiopipe AP1500.1D :: 4 cu ft @ 32Hz, 1500w @ 1ohm
Crescendo CCX65 Doors :: Pioneer 6x9 Rear :: Cadence CRS-Z9 4ch