Thats expencive. When I had mine in the ATR, it did increase the performance. Overall all my mods increased the performance from 212hp to near 235/240hp.
Some of the guys who dyno theirs had it shown on paper. So went off those claims lol. But on track I was quicker then most ATRs.
Over all, imo, this would have minimal effect on a car that has not been re-tuned and is cloged up with carbon. But getting more air into the cylinder is definitly a yes. It really depends on what you want to do really. If you want to spend less and have a simular but less effect, get the K&N panel filter. If you want to go full on performance, why are you asking, get K&N over anything, any day.
Things to remember, regually clean the filter.
If it comes with the cover, put it on if you can. After a while I took mine off.
The pipe and filter are also designed to make airflow less terbulent unlike the stock one. Most items on the Lexus are made for cost cutting, regulations and production. Mine for example can run at 204hp and yet get better fuel mpg, so why is it at 177hp? Money, regulations and Sales. I mean, look at my alloys, there crap lol (pains falling off).
Over all, if you have the money, get it, then look at getting an uprages Stainless Steal Exhust from the manifold back with a 200cell cat. (meow) Also, put in RaceX Oil as this will also ensure your engine runs smooth and well.
Other things to remember, brakes do stick and catch and slow you up, so free them up 1 time a year easily. Get better HT leads too... stock ones are crap.