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I did the Speed Engineering 1 7/8 long tubes with X pipe and we saw about 16 hp on the same dyno with almost the same conditions. I just made a few changes in the tune. I only use the dyno for tuning and it really means nothing when you get to the track. I ran 4 tenths quicker then and about 5 mph. So no other changes, don't let the dyno rule your day or make you pissed cause it didn't make what you thought it might. Go to the drag strip, thats your true dyno.
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