The guy at HobbyTownUSA said to and i did some research online which told me to.
http://www.quicktechhobby.com/articl..._that_tune.htm
"However, some engine tuners will go so far as to cut material off the header pipe (in small increments of 1/8" to 1/4") in search for the "ultimate" tune. This is recommended only for experienced racers with the proper tools."