Trying to figure out if getting rid of the T joint intake hose is possible if i want to install a custom cold air intake or is it a necessity ?
My intake tube has a big gash and i am not looking forward to spending 200 quid for a replacement, plus if i also get to have induction noises it's only a win win.

is this waffle like structure needed?

Hi. The box you’ve marked with a red X is a resonator chamber and it does have an intentional purpose as part of the air intake on a normally aspirated car. The VIS has additional tech in the intake system that yields the approx. 7bhp increase over the regular NA and apparently improves drivability. If you’re not aware, VIS stands for Variable Intake System. I think it changes the length of the intake depending on engine load. If you rip all of that intake pipe work off and stick a custom intake or a cone filter on I expect you may find yourself down on power and disappointed with the result. It’s your car and your choice but if you do decide to remove it I’d definitely keep everything you remove in a safe place so you can reinstate in the future if needed.

Perhaps someone else has done this on a VIS (or NA) and will be able to say for sure. I have an NA myself and am happy with how it is and wouldn’t do it to my car.

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what have i missed ?

Hi thanks for the response,
I know about the Vis system and i'm not considering deleting that , i was simply wondering if the resonator chamber is not essential,
because my intake tube is compromised and cant find oem part, since i was already considering putting on a cold air intake i thought might be better to just delete the resonator chamber,
replace the whole thing with a simpler intake tube, i already have a cone filter, would just need to get the piping and done, hence why i just wanna make sure that i can do that.
thanks.

The resonator is essential so changing this and adding a direct feed and cone filter the way you're planning will kill low down torque as mentioned above making the cars performance suffer drastically, Fiat designed the intake system to balance the performance of the VIS system so my advice is contact the guys below to see if they have a silicone replacement, if they don't I'm sure they might be able to remanufacture that pipe if you send it to them.

https://motorstore.fr/shop/gb/

I'm just curious as to the fact that people point out that resonator as being "part" of the VIS system yet its also shared with the 20v naturally aspirated non VIS, and reading through some paper documents that my dad had related to fiat coupe,
i saw mentioned the fact that their primary purpose was to reduce induction noise, and seeing dyno videos of other cases of use yes torque down low decreases slightly, but not to the point of killing it, but throttle response improves and you get a marginal top end power increase, i don't know how correct all this info is, but if i have to sacrifice a couple NM of torque down low, but gain throttle response, sight bit of horse power, simplicity and induction sound, then to me it would be worth it .
Then again if it truly doesn't "kill" torque but just slightly lose some, it seems that this subject is heavily debated and honestly i can never find proper objective info but just "purist" biased opinions or "15 year old without a car" opinion.
So it's hard to make a constructive decision.

I speak as one who in no way can assist you with your issue, but also as someone who would urge you to listen very carefully to the advice you've just been given from one of the leading coupe specialists anywhere

Greetings.
I understand your problem well, you would absolutely like to try with a direct induction tube eliminating the resonator but as Joe said (who is a specialist) he advises against this, at this point you can do nothing but invest a bit of money and really try if this modification is right for you by testing it, or accept the advice.
Have you already considered the idea of ​​finding a compromise, leaving the resonator and adding an open filter? Maybe I'm speaking sacrilegiously because I don't own a Vis but a turbo and therefore I'm zero in this matter having no experience, I can only tell you that almost always the advice on the forum has always turned out to be right, in the end yours is not an irreversible mod.

You may find the information on this page interesting:
https://planetsoarer.com/resonator/resonator.html

It’s about Toyota Soarers rather than Coupes but the principles are the same. They say that the resonator acts as a source of air and helps fill the cylinder with more air than a straight pipe. Removing the resonator had a negative effect on power across the board. Changing the resonator size gave control over higher rpm power vs low down torque.

Another interesting link:
https://physics.stackexchange.com/q...e-branch-intake-resonator-helmholtz-work