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well silvrstang your buddy must be up on a STD dyno just like he was.....im not bad mouthing in anyway, just saying there is no way his car is laying down what full bolt on cars lay down
knock off about ~4% on the 278 and thats what your at roughly SAE wise WHICH is the correct number
i had the same problem as you no one believed my numbers. my dyno chart read 319rwhp with only a mid pipe, cat back, and filter.....i looked at the dyno chart again and it said STD