Does the new F sport intake system not come with the lower box? I Went to the dealer yesterday to pick up my car from service, they put on the F sport intake for me. I realized that they didn't change the lower box. Therefore, my intake doesn't have an extra square hole on the side for more air flowing in. I remember i saw some threads that our members posted their intake with the hole. Should i go back to the dealer and ask them?

 

They did not change the lower box.

 

How much did you ply for the intake?If you don't mind me asking. I'm considering but not sure if it really makes a huge difference or just go with aftermarket

 

$320 shipped @ Sewell Lexus with club Lexus discount. Can't say it sounds any nicer than after market intake, but looks nicer to me.

 

i got it for free at my dealer as a deal. And yes Sewell always has good price for CL members.. it doesn't sound better or anything compare to the stock. i have the F sport exhaust so i can't hear anything different.

 

Hmm, without that hole in the lower box it should sound silent... I cut a hole in mine myself and that increased the sound dramatically, added that nice growl that greddy intakes have. With just a simple pipe you're really silencing the car since even the stock intake has some amplifier pipe for the sound.

 

i know right!! I am so confused that some people have a hole in the lower box and some don't. Why is it? I did some research and the pic showed that there is an extra hole beside the hole connect to the ram air pipe.

 

lino1011: You are probably seeing some photos of the F-sport intake for 2006-2013 cars mixed in with the 2014 intake. Also adding to the confusion is that Lexus themselves claim that the F-sport intake draws air from the headlight area, which it would have to do through a hole in the box... but it doesn't actually do so.

 

This is 'eye candy' - bottom line. I like eye candy - it does 'nada' for performance, and very little, if any for sound especially if married with the f-sport exhaust. VERY few intakes deliver the performance values stated. The ones that do 'usually' are set-up with a exhaust that breathes better (ideally headers), a cam modification and a tune. All these are limited on the IS. The ECM needs to know what to do with the increased volume of air for more power - add more fuel, this usually come with a 'tune'.
No ones 'butt dyno' can pick up on 4-8 hp - it becomes a mental satisfaction. No bashing here meant - but trying to be realistic.

As for the lower part of the air box - the factory one stays and it is already plumbed to grab air from the area on top of the radiator shroud - so nothing changes.

The intake is a nice accessory with the 'Lexus fit / finish you expect - buy it because it looks good, not because you think you are going to get more horsepower...