I just bought a 2003 Flair with the V-10 in it. Yep, it's slow up the steep hills here in souther AZ. And I know that isn't what you asked, but... I put a full Bank's kit on it. The next trip was to Costa Mesa from Tucson. It was night and day difference from before to now.
One little note, I'm an old drag racer, and there is no such thing as too much horsepower. But, I have to throttle back and understand what's happening here. I am going to pull my 24' enclosed trailer for the first time in a few weeks with my sand car in it.