Just bought March 20th, 08 IS-F UBM with white leather seats. Already had KN intake, new tires and Lojack installed. So far I love it. It needs front and rear brakes, I'm quickly learning that it will be quite an expense. Any thoughts on that would be great. Also, upon full acceleration there seems to be a pause between shifts. Is this normal? Could it have anything to do with the intake? What are some of the more beneficial performance mods to make?
Thanks for any imput
Welcome again. You can find various types of brake pads and rotors through venders on here and CL at a discount so you don't have to pay so much at the dealership. Below is a thread talked about the various types of break pads available for the F. Some are low dust, some give up a little from the stock performance, others are better, some are equal to the stock ones, etc. Take a look and see if you find any that you like. I'd also contact Sewell or Carson Toyota (located in Dallas and California, respectively) to find out about any possible discounts on rotors and such for being a Club Lexus member (join over there, search for their names and shoot them a PM, they can help you all through the site.
Secondly, the lag you feel when accelerating, I'm assuming thats when you press fully on the peddle or close to full peddle push, correct? That's been an issue among a few F's here and there, some notice it more than others. I would venture to say it's a software issue that Lexus needs to have resolved but no fix has come out yet. If you want to get rid of the lag a little, buy a throttle controller (either Blitz or Toms). They help to increase throttle sensitivity and reduce that lag.
Thirdly, I would do a search for K&N Intakes and such on here to find out more information about it, especially if you're going to get rid of it. There are other intakes such as the Joe Z and Takeda that keep the intake at the stock dual stage while giving you a little more ponies. The K&N takes away the dual stage intake setup. There are also worries of heatsoak under hot weather conditions, a search would turn up how some people helped fix this problem. There are various (although not an over-abundance) aerodynamic and interior parts you can buy through various venders as well as wheel setups, exhausts and a few other engine mods that you can find online as well.
Hope I didn't bore you and this information helps. Feel free to ask any other questions.