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The series 5 TII has about 200hp actually. The "wait" for turbo spool is practically nothing, driven correctly and kept the power band the car just moves quicker and smoother from a 40 roll or a stop. I've driven and raced quite a few Z28s.
The only catch here is that I consider a TII with a new exhaust as "stock" because true stock systems are so old and clogged that you can't boost past 2-3psi. Besides that the aftermarket exhaust does nothing unless you raise the stock boost, but that wouldn't be stock anymore now would it?
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