I have an ep82 GT starlet and I'm running a new turbo setup which is a top mount turbo setup t2560 with a turbo smart 40 external wastegate which suppose to has a 7psi spring. Currently, I have an exhaust leak coming from between the turbo and manifold and my issue is my car is running lean and yes I do have an aftermarket fuel pressure regulator install with a standard pump which I soon change to a 255 but the concern is can this leak cause my wideband reading to read lean and also cause the car to over boost because being that I running wastegate pressure with a 7psi spring and seeing more than 10 psi which causes the car to boost spike, it makes me wonder what spring and bear in mind on boost the car read rich which is 10.9 high on the wideband so I just need some solid guidance, but I aim to get the leak fix as soon as I can but need to know if the leak will cause this major issue