I would like to know whether is it necessary to change geometry settings for IS250
If yes how do i contact WIM

http://wheels-inmotion.co.uk/contact.html

Well the short answer is that you cannot change the settings as there's no camber adjustment (which the IS200/300 had and Tony used to correct the OEM settings). All it has is toe adjustment, front and rear.

Initially there was some issues with the 220/250 but these have been resolved.... The current Geometry positions offered by Lexus for the 220/250 are not in dispute.

well the short answer would be if tony could better the settings
he would as tony and mark are the best in the business
and no one else gets to work on my babe lexus

Apart from 4 wheel geometry check and adjust tracking there is only tyre pressures and these may need setting different to Lexus suggestions depending on your driving style and roads ( will effect tyre wear ). Mayve Tony will put some comments on this as he has suggested 2 psi extra for me.

Well like i said the Geometry side of things is fine... But?...... Typically an executive style of car is born around comfort meaning low tyre pressure and the tyres being sacrificial.

Research so far has welcomed a 2psi increase, this may go to three but not until we have more research done.