but 1 thing i've been wondering was...
how the count xhaust piping size efficiency...
lets say 1.8" 4 4g91 stock...
but wat about modded 1?
lets say stock 115bhp.. 1.8"
if modded till 140bhp...should we follow the 1.8cc spec?
how the count xhaust piping size efficiency...
lets say 1.8" 4 4g91 stock...
but wat about modded 1?
lets say stock 115bhp.. 1.8"
if modded till 140bhp...should we follow the 1.8cc spec?

