Dont think they are advans mate, they got avs centre caps? Also think the seat are vauxhall recaros http://cgi.ebay.co.uk/vauxhall-vectra-full...2#ht_500wt_1154
I had grown bored of my Gt and nearly sold up a few times as you may know? But that is because it has been off the road for over a year, as said tuning the power/handling will change your mind