That would be very interesting to actually know for sure.
I have a set of fender wells that I’ll use despite there tube length being to long for top end HP. The price was right and I’m not a track warrior. The extra torque on the street makes for a great fun feeling car. While the previously posted increases are a bit more than a good bit more. I don’t spend a lot of time up in the top of the rpm range. Street cars normally don’t.