MINI Cooper S Tuning Project 2010

Hello, I’m new to you….and I’ve got a couple of questions Have a question how do I get the most performance out of my Mini Cooper S bj.2005 the cheapest and the most out… I’ve already made up a phat of the look of my cloned Coopers something great but the need also steam under the hood the 170hp what he has is already fun but I want a lot more SPAß if you understand.. would be happy if you could help me with tips of exhaust systems etc.