Thanks for comments, white seems pretty rare, but once I saw one in white I had to have it.
As Arc says ST205 is first part of the chassis number on mine followed by 9588, only 10,000 built, so even V5 says ST205 - 9588 which is cool. The non GT4 versions of same basic shape are ST202's
I plan on doing very little to it, it has a Blitz Nur Spec exhaust system which is pretty big and very well made, and not too loud which is good, an HKS induction kit which I am not convinced on, so may go back to standard air box, or there is a modification to move battery forward and then you get straight induction run to turbo rather than have two 90degree bends which is supposed to make it feel a little more responsive, though it feels pretty good to me as is.
It also has Tein fully adjustable coil over suspension with camber adjusting top mounts at the front, feels very well planted on the road, and very pointy, & firm, though surprisingly not filling shaking loose firm. I think the torque split is 60/40 rear/front though need to check on that, but definitely doesn't feel front biased.
They do have a reputation of being very refined and TBH that's what appealed to me, someone a bit more subtle than an Impreza and less common though I do still like those as well, can't help it I love all the rally type cars from late 80's early 90's when it was really interesting to watch the integrale's, Cosworth's, GT4's, Mazda 323 Turbo's, Legacy/Impreza's, EVO's and Sunny GTiR's doing battle.
Otherwise I have just received my speedo/odometer converter from KPH to MPH which also removes limiter and getting a set of bespoke dials made for it from a fellow GT4 owner who runs this site
http://www.skewer.co.uk/ and I can't help being drawn to some nice red Recaro Speed's which I know red Recaro's in white car is a bit Honda (did consider an Integra Type R, but just didn't do it), but it's the same seats I have in the integrale albeit covered in Lancia leather and after seeing this Celica GT4 interior with rare optional Recaro's can't help but feel it would finish off the car and lift the interior.