Mini One Help Please!

[zTALBOT23z]

Hi guys. Just brought a 58 plate 1.4 mini one. Im getting a bit of throttle lag which I hear is common. Now I dont want to try and turn this into a super car I was just wondering if anyone had any knowledge or experience with this car and engine I'd really appreciate any help.

Ideally I'd like a bit more poke and a nicer noise to go with it. Im looking at fitting a new exhaust system but again clueless as what to look for! (should have stuck to vauxhall!)

Thanks in advance guys!