Thank you very much, yes I am somewhat in touch with the IASCA standards as I am a suscriber to many car sound reviews, and my car system was built keeping in mind al I have learned from reading them. Competition? well, as I live in Chile, until now I've decided that getting my Golf into the USA for a IASCA sound off isn't worth it, even as I think that with some tweaks I could make some damage in the amateur categories. As for the third-octave analyser,I've got a friend who owns a studio and car sound shop and he did all the tricks and they turned out exactly as Tony Fabris has stated. My advice would be using space-unfriendly 190 Kb/s mp3, as much of my music is now recorded at that bitratre and it sounds more than satisfying for in-car stuff.
As for the vinyl not skipping at bumps, as the folks at Crewe usually said, "Don't worry. We're working at it" :-)