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I'm new to car audio...kinda.... I know how to put together a decent system, hook it all up I know what most of that stuff means. But I've never been into the competition part and stuff like that....So I was wondering (at the risk of sounding like an idiot) what do things like SPL stand for and what are they? and I think someone mentions SQ....something like that.
Just lookin for some help so I'm not as lost from now on, also thinking about building a system to be in comps.

competitons is a tough game. its expensive and a whole shit load of work. i never stop when i have free time im designing or working on my truck. its more about the love for this sport over anything else. spl stands for Sound pressure level thats how they measure the loudness of a car. SQ means sound quaility

Some of the terms are covered in the FAQ section if you read over the guides there.

SPL is "sound pressure level" or raw volume.
SPL systems are "one note wonders" designed to be as absolutely loud as possible without regard to musicality.
These are event/competition systems, and not really meant for daily driving or listening to music.

SQ is sound quality. These are audiophile systems designed to give the most realistic, lifelike audio reproduction possible.

SQL is an amalgomation made of by combining SPL and SQ, and coined to describe SQ systems with a focus on getting very loud. SQL is a bit of a misleading term though since in all honesty I've rarely seen a good SQ system that couldn't get loud enough to cause permanent hearing damage, so most modern SQ systems fall into the SQL catagory by default.

The only other 'catagory' would be "Boom cars" which describe systems with no regard to SQ, and no intention of competition. These are just made to be as annoyingly loud as possible so that others outside the vehicle will hear the music. This is a phase most people seem to go through when getting into car audio before maturing to better system designs, and generally this type of install is largely frowned upon by the mobile audio community.

I read in there, and even loked for it....must've missed it...But thanks guys, and yea, I know it's expensive and everything, I know someone who does it. But thanks guys.

the thiele small thread has a lot of definitions