Normally sound accs shop will have contact, you can check with them... Many people will mod/upgrade proton car, other brand need to rely on technician's skill...
But why you wanna increase amp output? ICE modding?
eh...wannna ask again. if wan to tukar altezza enjin into 2jz-gte..anything wan to modify or add ???
AND ALSO WHAT IS THE PRICE OR AN 2JZ-GTE ENJIN COST ? ISIT WITH THE GEAR BOX ?