Further to your enquiry regarding lowering of your Astra, I have
discussed this with the service department and they advise me that your
warranty will be affected by using non Irmscher parts but not lost
altogether, your warranty would still be valid for failing parts
providing the failing can not be attributed to the lowering in any way.
I also asked for an price for fitting and was advised it would be
approximately £218.75 this is based on the job taking 2.5 hours, however
having not fitted these springs before this may be more if problems