Check your plugs and wires. Get rid of the MSD coil, and reset your computer.
It obvious your boost is low.....thats why your HP is kinda low.
I also think your dyno operator is off his/her rocker...243 with nothing but an intake is a tad high. I think whoever ran your dyno fudged your numbers.
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 First SRT-4 sold on Guam
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