Which one of this engines/pipe combos you think is better for my Xray NT1 (club racing)

http://www.amainhobbies.com/product_...ipe-Turbo-Plug

http://www.amainhobbies.com/product_...662-Tuned-Pipe

http://www.rc-toro.com/product_info....oducts_id=2057

or any other engine/pipe combo in $350 range , I'm looking for best performance/durability balance

Any suggestions is greatly appreciated