The exhaust setup i am assuming will get it to around that mark, but it isn't 147 to start off with. it's more around high 150's to 160. I am still to dyno mine with the exhaust work. Have to find some time, been busy with work. I'm taking it to the place that came with a dyno result of 160 on stock. 167 after powerchip (i'm assuming though it's still realisticaly around 160) and will tell you definately then how much gain a full exhaust setup will give you. My piping is 2.5 inch so you'll get the right idea, as that is what they are quoting you on.
Give me about a week or so.