im a little bit of a noob to the evos i notice that when my car is spooling up it sounds great in 1,2 and 3 gear but in 4 i dont kno how to explain this but it sounds like its hesitating but the car feels normal its just the sound. it started happening like 2 days after i install a MBC do you have any idea what can be the problem

 

you need to provide more info. How high do you have it turned up, does it happen at a certin RPM/speed?

 

Get a tune. Sounds like fuel cut possibly. Next time search and if you can't find anything, post in the newbie section.