I got an Audiopipe 1800.1d, and it as not that bad of an amp. It is a bit overrated though ( requires only a 120 amp external fuse).I Do not see how they say 1800 watts rms at 1 ohm load, but hey,they are quite affordable.
Well whoever heard that does rated power heard wrong... very wrong..
The math above is actually a generous estimate but it shows the important thing, that its absolutely impossible for that amp to do the rated power. Actual output will be less than ~1200 watts.
And then the name audiopipe is on it, that right there tells you its gonna suck.