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GT40 Upper and Lower Intake ManifoldGT40 Intake Manifolds and GT40P Heads from a 1997 Ford ExplorerGreat upgrade for mustangs with the 5.0L.GT40 intake is an exceptional upgrade to the fox body mustangs giving it anywhere between 20-30 more HP over stock.
These intakes actual OUTFLOW GT40 Tubular AND cobra OEM intakes look at my additional pic, you'll see the flow chart difference for them from 5.0 mustang magazineThese are GT40P cylinder heads. Higher compression than the GT40 iron heads.
You do not have to have special headers to use the GT40P heads.
You will only have to modify the #7 spark plug boot (and pending headers maybe #3) to a 90 degree angle boot instead of the normal 45 degree angle boot.
Equal length shorty headers will run into additional issues with spark plug clearance.GT40P heads and GT40 intake manifolds are a phenomenal upgrade from stock, getting harder and harder to find.