If you plan on just buying an cat back kit then it will not rob you of low end power, it should give you a little more... for a stock or near stock car an O/R pipe is a bad thing... the cats give you back pressure which gives your car some torque... if you remove the cats youll have more high RPM HP but less low end torque... with less torque your car will be less fun on the street... pluss it will not be emissions legal without the cats...
Phantom
------------------
CHECK OUT MY MODS
http://www.mustangworks.com/cgi-bin/...splay.cgi?1350