Line level converters

[EsSeX dAn]

hi all im currently using some cheapo halfrads line level converters in my mk4 as i want it to look standard from outside but i love my sub lol. problem is they get all sorts of interferance and there generally poopy.sounds like ive got someone trapped in my boot when engine turns on and ignition gets cut.does anyone have any recommendations for a semi decent set? i know the best answer is new headunit but like i say i want it to look standard from outside and i cant really afford a decent one right now :-(

[troublestarter]

if you are using the factory vw gamm/beta unit then buy the autoleads pc3-11 vw rca adapter
also have you run your rca's seperately to the power??
and where is your earth connected for the amp??