@roms
well it all depends about the effort and cash you want to invest in a project and things will change according to it
g13b or g15 or g16 all engine will be a bolt on fit into yr car
i just did a swap for a friend in cultus of G15
but when talking stock
g13b it has 100hp and around same figures of torque
G15ait has 95 hp and has 127 torque..which can out run a G13b
G16ait has 110hp and has around 12p torque...so technically quicker then all
But when u want to modify it and get extra power out of it
You cant not do anything to G15 or G16...other then doing intake...headers...piping..injectors...coil...remaping ignition..plugs etc....and stuff like that
which can give you about good extra 20hp
But
when it comes to g13b
you have alot of stuff..racing cams..Chipped ecu....high performance cultch ....high compression piston
and all the mods like stage 1 ..r utilized best when u tell the ECu about new settings
you can easily manage 135whp on it ..which is enough to out run a rx8 or h22 civic....
but again it costs to much