urm..... could try a 25bhp shot of nitrous? Still could be expensive though to get setup properly and fitted etc.
Gaining bhp isn't really 'cheap' tbh.
Ideally I'd just hang off and try to save for some engine mods tbh. If you bought a vts engine carefully, could get all the bits, and it fitted for £500-£600 if the right one cam along. Could do it for less if you fitted it yourself, nothing too difficult about it
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