Quote:
Originally Posted by JetSpeed
So, exactly HOW MUCH HP gain does a drop-in give you? Can't be much if it all. Why wouldn't Sub/Toyota add a drop-in during the factory build if it truly does gain HP?? Any real data??
Don't mean to hi-jack, just never seen any numbers.
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There are whole threads of numbers. Most are between 3 to 5 HP which of course is within the variation of dyno runs. The fun fact is that most whole intake changes give about the same numbers so there is little to no advantage (other than cosmetics) to throwing on a new intake.
What you do get is more noise and since the manufacturers wants to appeal to a broad range of people not just the "cuz' racecar bro" crowd they keep it quieter. There are also legal requirements that they have to meet that the buyer does not.