the chambers lengthen the inlet length creating more torque and hp at lower revs. they also absorb negative pulses when the reeds are closed stoping blow back and keep mixture flowing in one direction .

you can probly get a bit more top end which is good if u plan on keeping the engine above 7000rpm but not if your not.
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Honda nc23 CBR400 AERO 1986, 1990 honda NC23 Tri-Arm, 1987VFR400 NC24 Rothmans Rep, NSR250 MC16 1987, CL250s 1983. Moto guzzi zigolo 110cc 1958. Fantic 50cc 1972. Suzuki Cobra Race bike 500cc 2t 1975 , GP125 1975. Triumph T110 1954. BSA Thunderbird 1955. Ariel VB 600 1952, 1990 MuZ 125 etz.