I had two 12" TS-W2000SPL(they're the 1st-gen of the premier subs) ported in a VW Golf and I scored 148.8dB on an AC mic with just one 1000 watt Crossfire amp.
They were the best bang for the buck back in the day.
Quite sure someone here wouldn't agree with that, because nothing can beat the SA's lol. I've been wondering about those Pioneer subs also, as i have the Premier 2502spl 10'' (which is one hell of a sub) with 1200 wrms on each for the last 6 years.