Hi folks, two questions. I have removed the Renault head unit/radio and replaced it with a aftermarket Pioneer unit. The Renault head unit was attached to an amp under the drivers seat. Is this now attached to my Pioneer head unit, to increase watt power or is it just unnecessary weight??? The other question is, if you have a full fat car and install lowering springs should you change the standard shocks for Cup shocks? And if so could you just change the rear?