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5sPeed -
Like Red said try a lower thermostat. You might also want to try running higher octane fuel.
On my car, after a few runs I also start to lose power. When the engine is hot, the computer retards timing a deg. or so to stop detonation. This would be less of a problem if 93 octane was available in CA (damn 91).
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2005 MN6 Cyclone Grey GTO
Stock: 337.0rwhp,332.8rwtq @8.2k mi
*previous car*
2002 A4 Rally Red SS Camaro
Stock:CME,Bilstein,Auburn,T-Tops,Chrome ZR-1s,BFG g-Force KD 17",SS Grille,Deck Mat,& Floor Mats
306.9 rwhp,325.8 rwtq @ 6.4k mi
Mods:SLP_LID,Airhog,LS6cam+springs
338.0rwhp,336.8rwtq
SLP_Bellow,TBB,BMR STB&LCA
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