Ok im in the process of building a turbo system for my car, and i have a couple of questions. First, i see on the JGSprecision web site that there DIY manifolds have 2 diffrent pipe sizes, whats the bennifet of either. And on my t-28 it has a 2" compressor outlet dia. would it bet good to stick with that untill i hit the intercooler?
Like the intercoolers with a 2" inlet and 2.5" outlet?
thanks for any usefull info!


When in doupt, grub.

anything exhaust related, whether its the manifold, downpipe, or exhaust piping, bigger is always better for turbo. as for the charge piping, your manifold is going to be pressurized under boost whether you have 2" piping or 3" piping or anything in between. so its up to you what's easiest for you and what fits.

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450WHP Turbo Ecotec swap in the works...