go to alpine dump in langford, just ask for weight only (usually you weigh in then wiegh our when you dump lots of stuff) also, should be free
I hear that the way station is "on" at all time on the way to sidney, you can just pull in , park your car and weight will be displayed. I have yet to test this out.
Pn a side note, weight reduction is kind of pointless in my opinion unless your trying to shift the inertia of your vehicle further front or back.
Taking interior out + all sound dedening will make the bias more toward sthe front adn you'l have a higher moment of intertia towards the front making transistions even easier in your 240sx. As for "faster" 150lbs (most you'l get taking uot an interior) may shave off 0.05seconds of a quarter mile time.
10hp does more. So all these guys saying taking out their interior makes their car go faster is BS
(you can do the math to see how much it helps, and its barely anything)
either way, good luck.