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Sounds like you threw a lot of money at the WRONG parts if you wanted a monster - you bought a sound system, body kit, led conversion, before you put it into a turbo upgrade? and you are using megan dp's, random test pipes and a stillen catback? 555's and sport 500's? blow off valves? what did you expect for those mods? i doubt you are even hitting 450 rwhp on race gas, and thats expected because the limited potential of 500s on 555'cc's is pretty well documented, just do a search and there are numerous dyno charts of that combo on this board. z's can be monsters with minimal modifications if its the right modifications - you dont even have to open up the engine for it to make brutal power
 2530'ed up! 649 rwhp and 569 lb ft tq, on completely stock block, stock heads, stock cams, stock bottom end, tuned by SpecialtyZ on 5/23/08
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