This is definately an important question! Why doesn't someone (who knows how) create a poll?
I have the Magnaflow catted x-pipe and cat-back, and the Western Motorsports cold air intake (filter in fender) installed, and a Predator, 2.93 pulley, and 100 mm idlers sitting on my bench. Well last night I decided to try the Predator's performace tune. I would say that there was a sotp improvement, but occasionally, a slight stumble feeling above 5500 rpm. I did a search and now I'm a little nervous about leaving tune in, a ultimately about using pulley tune when I finally install the 2.93.
How many Predator users are using a custom tune versus the supplied tune?
Should I go back to stock untill I install the pulley?