Quote:
Originally Posted by Spartarus
This has been posted before.
I have called it out before.
I have illustrated it mathematically before.
That engine / example is in no way comparable to our cars.
First, it's running fixed AFR, fixed ignition timing, and fixed cam timing.
Second, it's a large displacement, 2 valve engine on which VE peaks below 90%.
In other words, that is not comparable to our engine at all.
I'll bet anyone double or nothing the cost of a header and my dyno time, that I can bust that myth on a dyno on this engine, on this car.
I'll bet anyone triple or nothing that I can cut the power in half on a motorcycle engine with the same size dents. (has to be the right motorcycle engine. I'm sure you could practically duplicate their results with a Harley motor, but I digress.)
Your point about stock decatted headers is valid though.
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Hopefully this won't start a long debate; I just wanted to acknowledge that there may be little argument going with a top quality (i.e. $$$) header when really the major restriction is the cat. Most headers eliminate the cat or have a high flow cat. As a Cali resident, there are no legal options for headers, and the best (low profile) illegal option would be a decatted stock header. Regardless, I doubt anyone could really feel the difference between a decatted stock header and the highest end header. Most changes will come from eliminating the cat and tuning out the stock dip.
I have a few arguments for your video critique and motorcycle comments, but I don't think they are necessary, and I'd rather not go off-topic too much. My point is above.