I call ryan the 'human TL'. Would not surprise me at all if he were within .5 db's with his estimate.

Hahaha... I'd have to hear it to guess somewhat accurately though, and the guesses at the double were just lucky. I'd say a safe bet for this guy would be between 130 and 150.

what the 130 if he F ed the box up and 150 if he does it 100% right

And anything else in between.

hay just moveing your box 1/4" can have your db go up or down
there so much more to it then your sub
what car ?
what sub ?
what box ?
how the box seats in the car
is your window open ?
there are more Q's

Great to hear that my bat and cap will be good to support the two 3000SPL's.

Even better to hear that I "might" be able to pull off a 140+ if everything comes together as planned.... and once again guys, I'm not gonna hold anyone to the estimates.

Really appreciate all the input guys and I'll let ya know once I have some pics to show the progress of the build.

Cheers.