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the 2 cars i've fitted 120mm trumpets on have had the slam panel removed, and bonnet pins fitted. I also trimmed the plastic part of the grille down flush with the top of the "waffle" section.
this is the only pic i can find, and it's without the bumper and filter
not aimed at you ;) :) a lot of "advice" from those who have never, and will never do anything like this themselves, but enjoy attempting to trample on the work of others.
except for where the throttle plates are, ie very close to the valves, which is what gives the big respose inprovement. And the airbox has been designed with internal baffles rather than just being a plenum
basically its slightly lean until a certain rev/load point, then it gets the fuel it needs to make power.
Similar strategy has been used by aftermarket chip companies for years to make the car "feel" faster
It's down to EURO4 emissions restrictions. They come alive where they're allowed the fuel they want rather than being held back by closed loop and a lack of acceleration fueling. Ph1 172s are better as the regs are slightly less strict (EURO3), 197 is worse (EURO5) the regs are more complicated...
Best is VERY subjective, and there's multiple justifications in each direction. Tuners use what they get on with the best and know the intricacies of. Some will choose the most basic ECU so they dont have to look at as many parameters, some will sell the most expensive and have very little idea...
you ever think to read what has been said rather than be destructive? Picture still shows total induction length to be about half what is necessary.
Try it yourself. Oh no wait.....
the disk is not threaded, only the hub. Pretty simple to remove a broken wheel bolt once the disk is off. you should be able to grip the end of the thread behind the hub