Sometimes when I see posts I don't exactly pay attention cause it doesn't really pertain to me at the time. However, I have my exhaust manifold off now and I'm thinkin' about a modest turbo upgrade. I need to pay attention. Which direct replacement units would be a good choice? I'm going to go with a box of some kind fairly soon. I just want a modest gain with slight EGT reduction. Already have the ATS manifold and 4 inch exhaust with a aFe proguard 7. Thanks.