hesitation help
if im driving on the highway going 60-65mph with no problems and then try to stomp on it the car seems like it hesitates for a second and then takes off til it gets up to about 75mph and then it bogs again for a second and same thing as it hits about 85-90 mph
should i try adding a gas additive? maybe have bad gas in the car or is maybe my cats starting to plug up?

only things done to the car are a new slp Y-pipe which throws a ses light (po420) code on a scanner ,and a new slp lid and a smooth bellows
any thought would be great

