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I was considering doing the same thing, and then someone posted a dyno of the before and after adding 555's and twin pop on a Z about our stage. The graphs were almost identical. While there is no doubt the extra saftey margin of the 555's is definatly better, it appears the extra flow of the twin pops makes little to no difference with stock turbos. I was trying to find the post for you to show you the dyno... but I gotta run to class. You might try searching for it. It's also risky to run a single maf on a dual setup as the one side is essentially running blind and there is no gaurantee the sides are in equillibrium at all times. If your going to do it it would be better to wired dual maf into an afc. Just my $.02 though. I think a better next mod would be an air fuel controller, downpipes or NA rear diff. Any or all of those would make a substantial difference. By the way your Z is looking great. Looks like you've done a lot of stuff to it since I've last seen it. Take care.
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