Chip/remap probably wouldn't ake much difference at all..If anything an extra 5-8bhp..
I don't believe the cost of the chip/remap warrants this small increase. Your better off buying a stainless steel exhaust, which would give you similar benefits..
As mentioned before, i would save for a bit, then get a turbo (either diesel/petrol) then have it remaped...Could potentially get another 40-50 bhp on these models...Remember, the 1.6 isn't designed for all out speed, so brakes, exhaust, suspension will need to be tweeked..Not worth the aggro...IMO