I hear alot about people doing this, does anyone have any pics? or exactly what needs to be cut out? Do you just remove the screws off of the deflectors and cut out the plastic underneth?
I have the dual inlet airbox. Thanks.

 

Cut all of that garbage out.

 

First of all, If you have a stock set-up, the extra air really won't make a difference...IMHO.

You know that black piece that the filters sit in? Take that completely off the car and cut all that crap out so you have two holes....the filters will sit right above them, obvioulsy without any obstruction.

 

Looking at your sig...It's probably not worth it. I did it because it's what everyone else did. If you are drag racing, maybe that one tic off the clock would be worth it, but you'd never really feel the difference.

 

Yes cut them all out and then remove the screens from your MAS. YOU WILL SEE A GAIN.........Abubaca anytime you remove a restriction Stock or not you will see a gain.




Brian

 

If you take a look at whats underneath the filters (wtf?) thats a whole lotta crap in the way of your air flow. You make the decision and remember, the stock dual snorkel is a great air intake which needs not be changed for aftermarket... so you cant hurt it by cutting the boxes, you can only marginally improve it!

 

That is not all correct. It will be a more than marginal inprovement. Did you see how small the holes are? Well NO you will not get a ram air from it ( can if you want) but the motor will be able to pull more air easier === HP.



Brian

 

OK, well, I didn't time it or anything, but I felt NO difference. Most people will tell you the same thing. The fact that our cars make good low end torque is due to the fact that our engines DO in fact get plenty of air. That is fact, not opinion.

Does the cutout boxes make a difference? Again, I don't have numbers to prove it, but since it can't hurt......might as well do it.

 

Give up the Butt-Dyno.

Cutting the restrictions out of the airbox Is not going to Turn your LB9 into a 11 second car, But it will make a marked improvement.

The Midrange Torque of the TPI dosent prove anything as far as weather or not the Airbox is restrictive.

The Airbox Baffles ARE a restriction. You don't need a Flow meter, Dyno or Track times to See this. It impedes the Flow of Air Into the Dual Snorkel. It is as clear as day.

As Such, removing it will Help.

 

I concur with Bort.

Whether the gains from it are none, small or great... the fact is that the stock air boxes do not allow as much air in as they could. Cutting them out will allow more air in which will yield SOME sort of gain.

 

As I said, I didn't feel it. As I also said, it may very well take off a tic or 2.

As for the butt dyno.....that's funny. But if you're not concerned about numbers....it's really the bottom line.

 

If your Not concerned about Numbers, My Girlfriends Z3 FEELs fast...

 

I cut out the air boxes, came out pretty good, thanks for all of the advice!! Another question if I may: The ducts under the airbox which looks like a path from the grill (foglight area) to the radiator, I dont have the foglights but still have this ducting. Is there any modifications to be done to this, looks like there is 2 small holes on top of these, can I drill the holes bigger? This ducting looks like airflow from grill to radiator. Thanks.

 

I didnt mean marginal improvement is all you can achieve. I meant in the least kind of sense, youre not going to hurt ANYTHING by cutting the bottoms off, and in the least youll see marginal gains. Oh and I think the ram air 'free mod' is something everyone should do. That will surely show gains in highway pull, as well as toward the end of a 1/4 run...

 

No, I'm not concerned about numbers, and maybe that Z3 is fast, I really don't know.

I realize that most of you do care about numbers, that's fine. Some of us just like to take the car out on the weekend for fun...and the ability to run 1 tenth of a second faster means nothing. If Benny cares about the numbers, then as I stated, the airboxes would make a difference. If you modify your engine, then the airflow restrictions certainly are more of a concern, but if you read his sig, he isn't planning much more. Given that information, the airboxes won't make a "big" difference.

Am I wrong?

 

yeah get that crap out

 

although you won't notice HUGE gains, i personally did feel a little gain on top end but i did more than just cat that stuff out, i routed dryer hosing to behind the fog lights creating that ram air effect. took a total of 1 hour, mostly because i broke the air dam and had to rive it back together, but yea it does help a tad

 

tpi cars dont make low end power because of good airflow. they make it because the intake runners are so rediculously long. thats all i wanted to say.