is a BIGbox a MUST HAVE? which effect has it? how much additional power can u generate? is it actually faster in total on-road?

normal rotary valve si carb box exhaust setup with just sip road VS more advanced: bbS+vcdi+1,5kg flywheel
result = 1,5s faster, but pretty the same till 80kmh

good2 know if its really worth it
1) just for city? nope, not needed.
2) also out.of the city 0-80kmh is most important = same speed
3) no loss in low rpm with a BIG box when setup is correct

setup:
FMPolini 177, longstroke (186ccm), si25, sip road v1 exhaust, , teninch central spark plug cylinderhead, teninch honda cnc clutch, 65/23 transmission (=px200)

#polini #BIGbox #tuning

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