How can I improve my TT-R 230?

I have recently gotten a Yamaha TT-R 230, Its great for my first dirt bike. It takes me where I need to go and I can have a little fun as well. But now I am becoming a more advanced rider. I'm Jumping, Hill climbing and all of the works. But I am having problems making it come up i.e for a wheelie. It does not want to come up I can be completely stopped and punch the gas and pull up and nothing happens. The only way I can get it to come up good is by popping the clutch, I don't want to pop the clutch all the time, makes it pretty easy to wreck. My friend has a XR 200 and as soon as he punches the gas it is up, well not for mine. I am wondering if maybe I get a new exhaust for it it will give more power? Or is there something else I need, he's got a Big Gun pipe on his bike. I currently have about 200 to pay for something to improve the bike. Its hard to find a good pipe for it i've checked Dennis Kirk and rocky mountain also other places. Well thanks. Also graphic kits, the bike is plain, I want it detailed out but cant find anything for it..