Dude.. go 700xx.. I have had it for 6 months and LOVE IT.
The power is great, I have raced a modded 700R was beaten by 1/2 quad.. and I am STOCK.
Plenty of power, night and day compared to the 400ex..
THE IRS is amazing and comfortable.. The backend is a little high strung in whoops.. lost my balls a couple of times, and 1 time the quad went up my ***.
Overall it is a great bike.. not to mention EFI over carb.
Get the big 3 and open up a whole new world of speed. PCIII, intake, exhaust.
over on club 700xx they have bo white maps.. people are very happy.
450R is a sick bike but still straight axle... punishing IMHO.
Oh, also the IRS is a bit tough to power slide, not that I am doing those often.
I jumped it this weekend,, stay on the back end and she floats just fine.
Overall it is an amazing quad... you wont be disappointed.
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