I am getting a pro tune next month, I ordered the flex fuel kit and a catless downpipe. My question is, how safe is doing a E50 tune on a Supra that’s driven 4 to 5 days a week? Will it cause any internal corrosion? Or cause future problems? I drive mostly like a grandpa and only give it the occasional hard throttle after the entire car has warmed up. What are your thoughts or experiences?