| Pretty much what bernie says, not a direct comparison. But both runs are already at the correction factor of STD which uses a standard temp of 68ºF vs SAE which uses a correction temp of 77ºF. if you want to see what it really put down that day with the current weather effects you use uncorrected. But quite frankly the combination of the manifolds, porting of intake manifolds etc are the total contributor. Did you gain anything from the manifolds? possibly.. can you say you did? possibly not. The head exhaust work with the intake manifolds most likely attributed to most of the gains since you already had some form of high flowing exhaust manifolds. And we know the Z32 exhaust side is weak in term of flow compared to the intake side. now going from stock manifolds to Ash manifolds would show the gains from the reduced back pressure and more flow. at least all those modifications showed some form of gains regardless of costs.
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