Originally posted by widebodyeclipse
those are for a turbo car from the factory. i believe they are a diff impedience and will need to be modified. too much pain in the ass. someone might be able to tell u for sue but i believe that is the case. u need ones specifically to fit the 420a hope this helps

they fit the furl rail but yea, different impedence. you need to solder resistors inline. PITA.

i'm just looking at some accel 330's