[91e30325i]

hey i guys i bought a 1989 mk3 7mgte from my brother. he bought it with a blown head gasket a few years ago fixed it then life happened and it sat in our garage for a couple of years.

a couple months ago i decided i wanted to get a track car so i bought it and have done some work to it but it is having a fuel cut problem. i installed a 2.5" straight pipe from the turbo to the back of the car, but whenever it gets around 3k revs it starts cutting out.
is this an injector problem, a fuel pump problem or something else
thanks in advance