gday-just my 2 cents worth if you are going to lower the car by any more than 1 inch you should always change the shocks to suit,this is mainly because the shock doesnt work the way it was designed and the oil and or gas gets hot and doesnt do the job it was designed to do,this is what i was told anyways. i had a falcon yrs ago that was lowered when i bought it with standard shocks and they were just terrible under heavy cornering etc,didnt stick to the ground well etc,when replaced with shocks designed for lowered vehicle the difference was incredible,they stuck like s..t to a blanket. just my opinion cheers