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Discussion Starter · #1 ·
I'm impatient and couldn't wait any longer for the aftermarket to release a performance intake setup for our cars. So I made my own by just replacing the stock box with a K&N cone filter. Pics below if anybody is interested in doing the same. The result is some muted but more apparent turbo noise which is worth the $36 I spent.

7mm socket
10mm socket
4mm hex key
3.5" cone filter
2+ Peronis

1. Loosen the bolts to airbox x4
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27289&thumb=1

2. Remove the 2 hex bolts holding box to MAF
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27297&thumb=1

3. Remove the air filter
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27305&thumb=1

4. Remove the bottom of the box. Undo the 10mm bolt pictured then tug up on the box.
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27313&thumb=1

5. The lower ait box is held in by two rubber gromets. Watch for the air tube directing fresh air in that attaches to the side.
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27321&thumb=1

6. The fresh air tube detaches by pushing in on the tabs on either side. I left mine in the car for more air flow.
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27329&thumb=1

7. Install the new cone filter on the end of the MAF.
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27337&thumb=1

8. Enjoy those Peronis!
 

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2017 Alfa Romeo Giulia Quadrifoglio
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You should wait bro. Intakes are coming very soon. The Giulia's stock intake is a cold-air intake so there's currently no better way in getting colder air in your intake. Right now your engine is inhaling hot engine air and will hurt its performance.
 

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Discussion Starter · #4 ·
The current intakes I've seen in development are very similar in design. The intake cone is in the same area as the stock air box. While the colder air does provide the maximum performance, warmer air, especially at speed, does not hurt performance especially over a restrictive factory box and provides a slight increase in power over stock. A true cold air intake would need to be piped external to engine compartment. Further, not that this matters but actual warm air intakes are better for mpg. There are several write ups on these topics online and below is a fairly rudimentary one. To be clear, I'm not anticipating a large gain in power nor do I drag race this car. I have another car for that.

https://www.carthrottle.com/post/amp/engineering-explained-cold-air-intakes-vs-short-ram-intakes/
 

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Good stuff.

Looks like you could get a larger filter with more surface area in there to increase air flow even more.

Agree with the nominal performance difference in IAT with a cold air vs a open air in the engine bay.
 

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I appreciate the DIY, since I'm a big fan of people taking initiative and coming up with solutions on their own.

The increase in noise is something that is subjective. Some people want louder engines, some want quieter. Can't argue that.

But, the air filter being open inside the engine bay is worse for performance, that is factual. The engine bay will introduce much warmer air into the intake, causing IATs to rise. IATs will dramatically hinder performance... Sucking in 10-15' hotter air from the engine bay will be far worst than the marginally restrictive air that's coming from the stock airbox -- this is dyno proven on several different cars.

Better option, put a heat shield of some sort on your open filter, or put the filter back into the stock airbox. You won't get the louder engine noise, but you will reclaim some of the lost hp.

A good test is, try to pull the IAT data from the OBD2... do a test lap around your neighborhood, include stop and go. Willing to bet your open filter sees higher IATs.
 

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I'm impatient and couldn't wait any longer for the aftermarket to release a performance intake setup for our cars. So I made my own by just replacing the stock box with a K&N cone filter. Pics below if anybody is interested in doing the same. The result is some muted but more apparent turbo noise which is worth the $36 I spent.

7mm socket
10mm socket
4mm hex key
3.5" cone filter
2+ Peronis

1. Loosen the bolts to airbox x4
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27289&thumb=1

2. Remove the 2 hex bolts holding box to MAF
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27297&thumb=1

3. Remove the air filter
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27305&thumb=1

4. Remove the bottom of the box. Undo the 10mm bolt pictured then tug up on the box.
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27313&thumb=1

5. The lower ait box is held in by two rubber gromets. Watch for the air tube directing fresh air in that attaches to the side.
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27321&thumb=1

6. The fresh air tube detaches by pushing in on the tabs on either side. I left mine in the car for more air flow.
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27329&thumb=1

7. Install the new cone filter on the end of the MAF.
http://www.giuliaforums.com/forum/attachment.php?attachmentid=27337&thumb=1

8. Enjoy those Peronis!
How you liking this?
 

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You can actually fit a narrow cone filter into the stock air box with a 30 degree pipe attached and bolt it straight to the MAF sensor. You need to trim the "cross brace" from inside the air box to accommodate but there is enough of it left to still support the stock filter if you wish to change it back.
I've done it as the OP had it and now how i've described it and i prefer the latter.
As for performance changes in the OP design (or mine) they were negligible either way but both designs did retain the increased intake noise.
 

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Giulia Lusso (TI) 2017 2.0 RWD Grigio Stromboli
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won't it be sucking in hot air?
Hot air = less power
Exactly my thought. These modifications are no power improvement, in contrary.
Pulls warm air from the engine bay. Warmer air has a lower density than colder air = less mass of air = less power.

Replacing the stock filter by a lower resistance one would be an improvement.
 

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Exactly my thought. These modifications are no power improvement, in contrary.
Pulls warm air from the engine bay. Warmer air has a lower density than colder air = less mass of air = less power.

Replacing the stock filter by a lower resistance one would be an improvement.
What about the turbo compressing the air and heating it up substantially? The intercooler solves that issue and I would think it would also remove any extra heat from hot air being drawn in from the filter? Yes in theory cold is always better but in the real world on a car with an intercooler will this even be a measurable change in performance?

I agree with you that a drop in filter is the best solution and what I have done for now myself.
 

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2019 Giulia Ti Q2, Performance Pack
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TLDR?
 

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The first ins’t an apples to apples comparison re: this thread, since that link is to testing 2 open filter intakes vs a closed vs. open design. It is speculated that to get the best performance you’d want the cone filter to be as close to the fresh air intake as possible (seen in the CTS intake design)

The second is more interesting if you have an open filter intake, as it shows there is next to zero benefit to having any heat shielding/thermal tape.
 

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The first ins’t an apples to apples comparison re: this thread, since that link is to testing 2 open filter intakes vs a closed vs. open design. It is speculated that to get the best performance you’d want the cone filter to be as close to the fresh air intake as possible (seen in the CTS intake design)

The second is more interesting if you have an open filter intake, as it shows there is next to zero benefit to having any heat shielding/thermal tape.
Thanks you :)
 
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