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I had my 99 Firebird actually ON a dyno when I installed the Whisper Lid. No other mods. Before, horsepower was 151...a little low for a 3.8, but not out of the ballpark. After, hp increased to 160...about what it SHOULD have been to start with.
So I would say the lid was a worthwhile mod.
The most bang for the buck is in the intake and the exhaust, and that is a fact. You can screw around and raise the box, but you really need to go all the way, and do free ram air. Cut the bottom right out of the air box. When you can see the pavement looking down the bottom of the air box you are there. I took only 1"x12" out of the plastic air dam under the air box. I had my exhaust system redone when the car was two weeks old. I use Mobile One, and the filter to match. I burn 89 octaine gas. I now have 15k miles on the car. It started to run very smooth, and very fast at 13k miles.
I know I have said this in a number of posts, but it works for me.
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