How much pick up with Direct ram air from front light to Turbo?

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Hey guys. We are putting a direct ram air on "Fear" through the head light, right into the big 91.5 turbo we run. How much can we expect to pick up in MPH/ET and what you noticed with these types of deals. I have seen 3-4 mph easy, with smaller turbos. THanks

 

[Bent6]

It will help but I wouldn't expect as much as you might get on a street car. The benefit comes from getting cooler air. You can't "ram" air into a turbo - it will only ingest as much as it needs.

 

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Thanks. I love Your car by the way. I knew Lawrence Conley well and your build. Love it man