Buddy of mine checked out my cheap $100 subwoofer, and instantly asked me for me to help him out.
Handed over a cheap subwoofer (cracked it open and it's all molded and rusted out), with a cheap amp.
Tested everything out, cheap amp seems to work fine, but the specs are very sketchy.
I'm calling out Harold here (I think he helped me last time? surprisingly?

)
What are the suggestions!?
Budget is $350 for 4 speakers and sub and amp.
Vehicle is Ford Mustang 2004 model, coupe.
Very open to powered subs again since they're dead easy to work with, but can't find many.
Specs of amp: *A cheeeaaap amp, so I would definitely not expect these actual numbers*
XM-7676 C/W
2 CHANNEL POWER CHROME/WHITE AMPLIFIER
MAX OUTPUT POWER (4OHM): 300W x 2 = 600W
POWER OUTPUT: 130W X 2 @2 OHM (260W) LESS THAN 0.5% THD
80W X 2 @4 OHM (160W) LESS THAN 0.3% THD
BRIDGED 260W X 1CH @4 OHM
MOSFET DC-DC SWITCHING POWER SUPPLY
VARIABLE LOW PASS FILTER
VARIABLE HIGH PASS FILTER