this is what confuses me:
http://www.autotrader.co.uk/articles/2008/05/cars/lexus/is/sporty-new-lexus-is-250-sr-announced
SR model is based on the IS 250 Sport, but Lexus claims it adds £3,500 of equipment while costing just £1,000 more than the Sport.
For those who want an even sportier look, 18-inch 5-spoke alloy wheels are available as an extra.
Inside, features include 10 airbags, climate control, cruise control, keyless entry and engine start and LED interior lighting.
Sporty touches include aluminium scuff plates bearing the Lexus brand name, and pedals with a racy design.
Heated front seats and a leather covered sports steering wheel and gear lever are also fitted as standard.
The Lexus IS 250 SR is available in black, grey and silver and it goes on sale from 19 May for £24,990 with a manual gearbox and £25,800 with an automatic.