DIY: Z1 Intake Plenum and Spark Plug Swap [Picture Heavy]

Originally Posted by synolimit

That's only 500rpm and probably a MAF spike. You wont be able to feel that or compare it cause look at 4000-4500rpm. It says the OEM made the opposite vs 4500-5000rpm. Hence why run 7 and run 12 both make the same TQ.

I wouldn't say it's clear, what else was done? Do we believe this with no other data? I hate peoples belief sometimes in a big company that what's put down on paper must be 100% true.

I did this already but I compared the OEM mani vs a ported upper, lower and ported throttle bodies. Theres a reason they won't show you OEM vs just a ported upper (1-2hp maybe). My testings not complete though. We will redo this soon with this cars cats remove.