Would those with experience, please share what preparations, if any, you have made to get ready for your custom flash. Spark plugs change, air filter change, highest octane possible, oil change, etc. Is any of this completely necesssary in order to receive an optimal tune. I've seen just a few questions asked about this and I feel we need a whole thread dedicated to it.

 

This: https://www.evolutionm.net/forums/sh...d.php?t=135665