I've got a 55reg A3 2.0TDI QS, and as with every basic A3 the bum is sitting pretty high off the ground. I believe (correct if wrong!) that the S-Line and S3s have lower suspension. Would this be a viable swap? How much would I expect to pay? Would I get away with this without declaring it on insurance as they are OEM? if not, how much does this mod normally increase the premiums by? if it does increase, would it be worth going third party for roughly same price and quality? Thanks in advance!