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Exactly my point....they added all of their gains individually to get a total (which is BS). Did they do a dyno with all 4 mods together? I must have missed that part.....
Say Injen does a dyno on a stock car then stock + SRI and gains +12 HP to wheels.. You can't take that +12 and add it to Stillen's +1X they got for adding an exhaust to a stock car, etc..
What they did is a dyno after adding each part, showing how much more gain one part added on to a vehicle with certain specific mods already on it.. In general, you may get another 4-5 hp etc from adding this or that..