Can tell you now that 95% of people will say go for a remap not a chip.
Also, it's your clutch that you need to worry about, more than 300lbs on a remap will cause it to slip more than likely.
The next thing people will say is, have a search, there's plenty of threads on this both here and in the Mk1 section. We won't be able to tell o anything that's not been said before.