Will air temperatues have an impact? If so .. You need to do it all in the same day around the same time.

It's a hard mod to see a difference from.

If anything, I'd say Airflow would be the same, but spool would be a little sooner, and perhaps slightly better throttle response.

Colder charge temps = Better performance, less chance of detonation .. But also brings on issues of possible overboost when it's really cold.

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Should have bought an STI