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Originally Posted by RandallNeighbour
I do think you get a couple of HP out of it. I'm planning to do it next year. Letting the car suck in more air can't be bad.
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Mods are always a tradeoff. We just don't always look down the road to see what the side effects will be. It has been tested and proven that the K&N/EVO oiled type air filters do let in a little more air, especially at high revs. They also often foul the Porsche MAF sensor causing a check engine light. We also know through testing that they let a little more grit in which will shorten engine life.
In a racing application you are not worried much about engine life. Performance is everything. In the Baja 1000 you build it to last 2000 miles just to be safe. Often it doesn't make it to the finish. You plan on rebuilding after every race. Track racing is the same. You plan to rebuild often. Performance is everything. K&N is your friend.
A street car is a little different. I want it to be reliable. I don't plan to rebuild often... if ever. A new Porsche motor is expensive... about the same price as a Corvette 6.0L crate motor. In this case I am very interested in engine life so I want the best protection from grit I can get. I really don't care about intake noise. I choose to keep my excellent Porsche air intake and paper element. I gladly give up a few ponies at rev limit in trade for 20-30K longer life on my motor, abscence of CEL issues and general peace of mind. It's always a tradeoff.