stock exhaust vs evo2 greddy

ok so idk im just a little lost and want to know what you guys think

so i installed my JR street kit and only have my intake and dc race header and he ive seen and felt good gains
so this weekend i finially reinstalled my evo2 greddy exhaust system and noticed that around 2-3.5k rpm its like a little bogged down and struggles to pick up.
so was wondering if it was just cause of the larger pipe that it takes a little for the boost to build up
its kind of hard to tell which one is better but im sure for high speeds the greddy is better and probably the stock for lower end power

decided to go stock and chop it up to fit greddy pipe ill post pics of once its done

Do you have Kpro and a tune? Opening up and letting the engine breathe more with any type of forced induction will require kpro and some type of tuning.

saving up at the momment to grab kpro only need 600 more bucks i just hope nothing else goes wrong maintence wise on my car

I hope your running JRSC's powercard at the minimum :/

Hahah yea that's a must idk who would be dumb enought to run it without one that would be super lean