4500 watt RMS amp. Many have been bench tested to output 4800-5200 watts under a variable load (not a nominal load--variable loads are real world tests) Like new used for a year, built a competition truck but enrolled into school this year and just don't have the time or money to compete. Did two competitions this year, truck was the loudest at both and won 1st place in my class at both. Just testing the waters as OR isn't a car audio board. I can get pics if there is interest. Considered to.be one of the best amps on the market. Price is $950. These amps new go for $1500-1700! Specs/stock pics http://www.woofersetc.com/p-9251-saz-4500d-sundown-audio-4500w-1-channel-monoblock-amplifier.aspx Link fixed***