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The airbox fits 4 inch pipe in almost perfectly so i wouldnt use any smaller there. The snorkel outlet in the guard is 3.5'Perfect world i would of used 4 inch off the airbox down to a 3.5' 90 into the snorkel but i already had these joins on hand and half an inch is barely going to make any performance difference on a turbo car.There also isnt much room in there to get the angles right so 3.5' may be abit tricker to get everything in.
The airbox fits 4 inch pipe in almost perfectly so i wouldnt use any smaller there. The snorkel outlet in the guard is 3.5'
Perfect world i would of used 4 inch off the airbox down to a 3.5' 90 into the snorkel but i already had these joins on hand and half an inch is barely going to make any performance difference on a turbo car.
There also isnt much room in there to get the angles right so 3.5' may be abit tricker to get everything in.