Performance wise; no. I do know the Z1 is 2.5" ID. Idk Stillens ID.
I have a ported upper and TB's on order to match my ported lower. 63mm is 2.5", so it should work really well. I may not have test results for a while tho.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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