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Another cheap and effective (especially in your winters, I'd think) is the hot air intake mod. Disconnect the OEM breather pipe at the air filter box, and run a piece of SCAT ducting (or other heat resistant material) around behind the engine to pick up hot air from the cat converter. This will increase fuel economy by warming the engine sooner and so allowing it to go into lean burn more often.
Monitoring the IAT via ScanGauge is useful - I see 120-140F as good operating temp.
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