700xx aftermarket exhaust/tires/handlebar Q’s

I just purchased a stock2009 trx700xx and I was looking to hook it up a little bit.
First, I’m wondering what aftermarket exhaust would increase performance the most? I had both a yo shi and pro circuit pipes on my 400 and 450r that i liked a lot but I can’t seem to find those brands for this quad. Also, since this is a fuel injected quad, what computer programmers do you guys reccomend?
Next, I’d like to replace the stock tires but choices are slim for the 11 inch rear rims. Are there any rim options that would allow me to run 10 inch rims with the stock offset? I have a set of 20 inch razor 2s that I’d like to use.
Last question, what handlebar setup is everybody running on this thing. The stock bars feel weird so I’d like to upgrade to something thicker and better feeling, maybe even a anti vibe setup.
If anyone has any other suggestions I’d be glade to here them. I sold my 400ex and 450r last summer and decided to pull the trigger on this 700. I know little about what works for this thing.