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IMO the best bang for your buck will be a Diablo tuner....
 the diablo preadator took my magnum from a stone stock 14.55 @ 95 to 13.82 @ 101! you should be able to find a used one (make sure it's unmarried) cheap on the LX forums also get 180 deg. thermostat.
from what i understand, the pcm will start retarding timing when the coolant temp. closes in on the stock 205 thermostat. i could definitely tell a difference. around $13 at auto zone
'06 Magnum R/T Daily driver, 5.7 N.A.- [email]12.63@109[/email]
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