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I have one - i can't sense any difference. But i'm perhaps not sensitive to what 7HP could even feel like.

BTZ461 wrote: ↑Wed Jan 22, 2020 9:29 am Great install write up. Resurrecting from the past here, do you recall whether there was a performance increase?

Thanks
Performance wise - No
Eargasm wise - Yes

Woodrow wrote: ↑Wed Jan 22, 2020 10:17 am The paintwork on your car looks amazing. Would love to see the whole car.

Thank you It's holding up quite well

Smartbear wrote: ↑Wed Jan 22, 2020 12:20 pm Not sure what’s happening with the filter fitted to the bulkhead? Looks like that’s displaced the sound generator tube, so not sure why you removed some foam from it if it’s no longer in use?
Rob

@Darkangelv2 covered it pretty well

ph001 wrote: ↑Wed Jan 22, 2020 1:38 pm To be fair the OP's thread was almost 10 years ago so probably not around to answer / care!

Of course I'm here And planning on staying here for 10 more

Darkangelv2 wrote: ↑Wed Jan 22, 2020 6:09 pm Basically he has removed the sound generator elements shown and put the small filter over the pipe that funnels sound from the engine bay into the bulkhead. It should still serve to pull more sound from directly behind the AFE into the cabin - hence removing the foam.

That's absolutely correct

ph001 wrote: ↑Wed Jan 22, 2020 8:02 pm ....but it does omit the resonator which plays a critical role in ‘amplifying’ the engine note. I guess you just get a different characteristic with this method, although I certainly have my doubts about it’s effectiveness. You are also directly porting any fumes etc from the engine bay into the cabin (the original resonator is effectively sealed).

Fumes would be noticeable, yes. If I did not remove the foam it would be more quiet in the cabin.

Darkangelv2 wrote: ↑Wed Jan 22, 2020 9:07 pm With the more ‘open’ design, I wouldn’t think an additional resonator is needed to ‘amplify’.

Isn’t the mini filter is there to take care of any fumes? Not there should be anything nefarious coming from under your bonnet other than the fresh air coming from in front.

When taking the car to the track I can very well smell the burnt rubber and petrol from the cars in front

z4pilot wrote: ↑Wed Jan 22, 2020 9:15 pm He's still very much around - has won the photo comp quite a few times

BTZ461 wrote: ↑Thu Jan 23, 2020 3:38 am Not interested in the sound generator stuff, my comment was directed more to an increase in performance. Even a butt-meter sense would help me here. Anyone else added this air box to a Si?
Thanks for reading
Bill

No increase in performance, just nice sound from the engine.

Darkangelv2 wrote: ↑Thu Jan 23, 2020 1:20 pm I have one - i can't sense any difference. But i'm perhaps not sensitive to what 7HP could even feel like.

Neither do I.

That’s a stunning Z. Looks amazing.

@StigJ
Thanks for the reply. Its quite an investment for an additional aural enhancement, We will stick with the air scoop behind the grill. (tinkering with the sound generator did nothing for the ears whatsoever)
I can sense a remap coming up.........

Woodrow wrote: ↑Thu Jan 23, 2020 8:35 pm That’s a stunning Z. Looks amazing.

Thank you

BTZ461 wrote: ↑Fri Jan 24, 2020 1:47 am @StigJ
Thanks for the reply. Its quite an investment for an additional aural enhancement, We will stick with the air scoop behind the grill. (tinkering with the sound generator did nothing for the ears whatsoever)
I can sense a remap coming up.........

Air scoop have been on my list for ages Never got around to get one.

Definitely interested in if this actually gives the performance a slight uplift. I know they’re renowned for being difficult to reap many extra bhp/torque as they’re so well designed. But every little helps

Is this mod likely to suck hot air into the engine (rather than cooler ambient air ) ?

They come with a heat shield so no not really, possible a little warm air may get in but the scoop should be pushing most of the air in from outside

I usea pipercross filter in the original air filter box. I think is the best and easier way (and cheaper)