Im not exactly sure wats wrong with my car but here goes:

Lately the car has been "bogging" or "choking" in boost.

I just changed the cat and exhaust system except for the Muffler
which has 2.5 piping, (the cat and exhaust is 3") i can't afford a
new muffler right now. i'm wondering if im still gettin back pressure

I also think it might be a dead piston but i havent did a compression test
in almost 2 years.

Anyone have any input on wat it maybe ? Car sputters, and chokes at WOT

 

aww anyone ?