If a Performer is not as good as a stock 340 manifold, and a Performer Air-gap beats a Performer by approximately 15 to 20 Horsepower throughout the range between 3K to 6K, then if you split the difference for the stock 340 to 8 to 10 Horsepower gain between the 3K to 6K range, The difference is not worth my time or money to change to a Performer Airgap for the street. I can easily make that up elsewhere, especially if I can run my TQ.
