I finally had the MAP ported & coated exhaust manifolds installed today! Below is the before & after dyno chart. I'm very happy with the results, and the shop said they were surprised by the gains. The gains were about half what long-tube headers show which I think is fair considering these are emissions, warranty, and stock tune friendly by retaining the stock pair of primary cats (the X-pipe install from last week deleted the secondary cats).
+11WHP/+8WTQ
Full mod list:
-AFE intake
-WeaponX ported throttle body
-MAP ported & coated exhaust manifolds
-Borla X pipe
-Diablo InTune (custom DiabLew tuned)
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