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I would really really like to see a picture of your dyno plot. Can you post it anywhere??
I had the same mods except stock ECU and stock exhaust (and PRCAI with K&N) and I got 140whp. Swapping just an aftermarket muffler gained 5whp. I would expect you to be closer to 150 peak whp. What wheels/tires did you have?
http://members.home.com/noslo200/jason%20muffler%20swap.jpg
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