Loudmp5 10+ year member
skyhigh&banginlow
A budget build in my eyes is around 800, to answer that question... That give you enough to buy a descent deck (150-300), A descent sub, (used 100-150)(new 180+) obviously you can spend alot more but that will be an OK subwoofer. Now amps you want a good amp thats gunna last, That being said i would spend up to 300 or so on a new amp for a descent sub look around 1k rms and you should be happy. Watch the gains and bass boost etc. READ HOW TO SET GAINS FIRST... A box is the most important... or pretty **** close. Wire you can prolly get buy with some 4 guage get ofc. idk what that cost maybe 100 bucks. Anyways thats my opinion. But really i hate stock door speakers and **** so that still aint SHIT