Le snorkel bride à 200% l'arrivée d'air sur le B12.
A lire si tu comprend l'anglais:
http://www.portablepct.com/fastlarry/banditfaq.htm
The 2-inch Mod
This is a modification to the stock airbox where you basically cut a 2" hole to allow more air to flow to the engine. This generally requires re-jetting or shimming of the carburetors. You can purchase shims from Radio Shack, part # 64-3022A .You should also read Moonray's Wrenching for Idiots if you're not sure about modifying the stock airbox. This is recommended for the 1200 model only. Doing the 2-inch mod to the 400 or 600 model has no effect. The stock airbox (without the snorkel) can flow more air than the engine would ever possibly use. Check this link for information about the flow rate of the stock airbox versus the 2" hole modification.
Anatomy of the Krazy Ed 2" hole mod
It's a well known fact that the Bandit 1200 is starved for air by the teensy-weensy airbox opening (originally designed for the Bandit 600). I decided to see just how bad the situation really was...
2" Hole -> 2 inch diameter = 50.8mm = radius of 25.4mm
Snorkel -> 1.5 inch diameter = 38.1mm diameter = 19mm radius
Stock Carb -> 36mm diameter = 18mm radius
(you can already see by this that the 1.5" opening in the snorkel is about equal to the opening of *ONE* carburetor)
single 2" hole area = 3.1416 * (25.4mm * 25.4mm) = 3.1416 * 645.16 = 2026.83mm sq.
Single 36mm carb area = 3.1416 * (18mm * 18mm) = 1017.88mm sq.
1.5" snorkel area = 3.1416 * (19mm * 19mm) = 1134.12mm sq.
36mm area * 4 carbs = 4071.51mm sq
2" hole area * 2 holes = 4053.66
So, the carbs can utilize up to 4072 sq mm of area (at full open). Leaving the snorkel in place (with no other holes in the airbox) gives you only 1134 sq mm of area (less than 28% of what the carbs can utilize when fully open). Using the dual 2" holes gives you 4054 sq mm of area (99.6% of what the carbs can use).
Si tu comprend pas l'anglais, utilise google traduction.
En gros le snorkel a été mis en place par suzuki pour réduire le bruit des carbus et bien sur bride l'admission.
Le conseil est de virer le snorkel et d'augmenter le diamètre du trou d'origine dans le couvercle de la boite à air à 2 pouces de diamètre afin que l'entrée correspondent à env. 99.6% de ce que les 4 carbus veulent aspirer 100% ouvert (à haut régime).
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Non je blague.. je vais voir si je peux faire un run ou deux , déjà il faut que je ressorte la 11 car cela fait un moment , c'est cool on se voit alors j'y serai samedi vers 10h30. 
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http://www.youtube.com/watch?v=x2gw5F6e ... tube_gdata
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