There are cars lowered more than 40mm using standard shocks, just that if the car is certain age or certain mileage as in quite high mileage then its best to replace the shocks same goes even to cars lowered only 30/40mm and yes i always been told max lowered to 40mm on standard shocks ! as said yet again i know people lowered their cars 45..50mm on standard shocks and not have problems, another point is brand of springs is important as in reputable brand such as eibach, not sure if tenzo r is any good or not. geometry track/alignment should be done as for arb kit that only makes difference in cornering, if you want to make your car handle well its worth since is noticeble more than strut bars
