Typically new pipes will require rejetting.
You should put a lid on the airbox with an outerwear like this.
---> http://www.ehsracing.com/products/banshee_airbox_EHS.htm
And you should swap out the POS stock air filter in favor of one of these.
---> http://www.vitosperformance.com/atv_parts/product.php?productid=797&cat=186&page=1
Also for even more grunt, throw an adjustable timing plate under the stator set to +4* and you'll get an even larger seat of the pants feeling.
I actually have one for sale for $30 shipped BNIB.