Thanks for the replys guys.
Coconut - i was more referring to where you can get parts from. For the headers i was looking for megan racing seem to be the cheapest however there is minimal information from those that have put them on. PPE headers seem to have the best reviews and output however trying to get parts from the states is almost the same cost for shipping. So been trying to find a place here that might have a supply line to the states or something that i can get the headers and there also the rest of the exhaust together with a couple of f-sport items.
Same thing for the head unit upgrade. All i wanted to get is the usb input which i found vasitech mml to be the best option, but then i was thinking of getting one of the fly audio units. Long story short fly audio dont make one for the 06 is 250 any more so will have to get a mml but the supplier here doesn't list it as being available any more which vaistech head office disputes.
I did get in touch with Green Global and he has been both very helpful and informative. But also trying to find our what/where/who else everyone uses to get parts for their cars.
Gotta say it, really suprised about the lack of lexus modification sites. I know the is250 isn't the most commonly modified lexus as people think its not worth it, but for a comfortable car with just a little more kick i think it's a decent platform. Just my two cents.