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Originally Posted by eslai
I highly doubt Bruce was looking for Backpressure 101, I think he was just questioning why anyone would think that removing the secondary cats would make a significant amount of power.
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8hp is a significant amount of power. Because you get 8hp from headers and 8hp from exhaust and 8hp from intake etc.. So all the sudden you made say 20hp from the extras.
The thing is, you can feel that HP increase even when it's small, you will also have increased throttle response because the engine is now more efficient pumping air in and out with less restriction.
It's not Backpressure 101, however people seem to lose sight that any gain is a gain. When building a race car weight is a huge problem. We do everything to take weight out, and more than you think. Eventually we get into ounces of weight saved. We cut metal from the trunk and doors just to save 10 ounces of weight. Anything and everything you can do. Eventually all those ounces you pull add up to 10 lbs of extra weight you pulled, makeing the car better at it's job. So each HP even if it's only 1 is a increase, you just add it to the other small increase you work to get and they all add up.
Race a car for real with a track only car and you will understand what I'm talking about. Guys use different weight oil for different temperatures because a 0-20 will give 6 extra hp over a 10-30 if it's not very hot out.
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