When I was driving my Sonoma, I'd respond with the truth which was 2 10s or 1 12. If you build the right box, you don't need lots of power or big subs to slam!
I had 2 RE10s on 400 wrms, then I switched them out for a 12w7 with 500 wrms. Both were ported, and I always got the thumbs up sign from people and also compliments/questions.
Now with my nissan, I get dirty looks and eye rolls. I guess 2 ported audiobahn 12s on 900 watts rms is loud but doesn't sound all that great when its trying to flex the trunk lid.
Don't anyone give me shit about the audiobahns, a friend let me borrow them and they don't sound half bad.