Ya, but they never once point out that they OUTRAN intakes made by folks who had a "clean slate" to work with, so no rules and few limitations. They just cry "foul" instead.
I'd also add here that these companies are marketing genius's. They tell us that all these parts are just waiting to be installed to make MORE power at every RPM, walk on more water and leap taller buildings. I been watching folks yank the EXCELLENT cast iron intakes off of SBC engines for half a century now and replace them with aluminum intakes that do nothing more that unload some money out of your wallet and take a few pounds off the front of the vehicle. In at least 95 percent of the applications they are used in you just end up with no more if as much power and loose some thermal efficiency until the engine is really well heat soaked.....FWIW......
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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