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To answer OP and to correct LEX-SV... There is no true COLD air intake made for the IS All aftermarket intakes are just a shortram A true cold air intake usually runs longer piping and to the bottom part of the engine bay away from the engine in order to get "colder" air (because heat rises) Now there is a member on clublexus who has done a custom true cold air intake you can take a look http://www.clublexus...lter-setup.html Now for LEX-SV...he has a point but not fully true. Stock intake is not a "cold air intake"...it is simply "colder" compared to ANY aftermarket intakes because it gets air from directly OUTSIDE of the car (if you've looked at the design of our intakes you would know what I mean) However, it doesn't get air from outside + BOTTOM of the car, and there is still interference from engine heat Compared to aftermarket intakes which get air from inside engine bay which is like hot from the engine That's why a lot of people just get a Joe-Z Intake pipe and put in a K&N, FSport, HKS, etc. drop in filter (technically same setup as the FSport intake) because you're running an aftermarket pipe which is where the the gain in power comes, while maintaining the "colder" air from stock intake box This setup doesn't add any noise or growl so some people get the FSport intake box and filter only and use it with the Joe-Z pipe, or simply use stock airbox and cut a hole (if you compared stock and FSport intake box, they are EXACTLY the same except for that hole in the FSport which adds the noise) Many options available for aftermarket though (Takeda, Injen, AME, AFE, etc.) But I particularly like the K&N Typhoon because their intake comes with a heat shield which actually does something (I've went for long and hard drives and after put my hands on both sides of the heat shield and the engine side is noticeably warmer than the intake filter side) As well it's got an amazing growl, makes the V6 sound V8 Only downside is the cleaning part which requires re-oiling.... As for power, all intakes add more or less about 5WHP (Joe-Z pipe with stock airbox dyno proven to add about 6ish for IS250 and 4ish for IS350) Most intake companies claim 10, 12, etc. HP gain is really just marketing BS Even taking into account of power loss from the average 5 WHP, is really just 6-7 BHP gain so 5HP is nothing you can feel in real life at all, people just do it for the sound really as well a better air:fuel ratio because you're intaking much more air into the engine as the stock tube restricts a lot of it ANyways, yeah...