any mech who tells you to make your exhaust free flow by just making it empty . that is pure BS .
IMO keep your engine stock
aftermarket filters and re-jetting is OK but needs to be done properly
even after some insane tuning how much power can one get ? 21bhp ? even if we make it 25 bhp ! it wont be worth the time , money and pains undertaken .
it works for speed-runs etc but not as a daily drive . this aint japan .
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