Have you checked out ls1tech? Guys usually run 3", 3 1/2" and rarely 4" dp on the ls projects. Some people tried to run 5" downpipes but lost TQ down in the bottom range of the curve. Also, running a 5" dp will hurt the spool time of the turbo. I have been doing tons of research because I would like to run a single turbo in my camaro.
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