[Studigs]

  I have a 2014 classic chrome c5 and have just had the 535 upgrade kit with beefed up cam put in and was wondering what spark plug other people are using who have had this done and is a iridium plug better. Also I have been getting a flat spot every so often when  cruising at low speed , and I throttle off . Any ideas would be helpful  , thanks. Stuart

[BB2023]

How Re you getting on with the 535 upgrade? I been thinking about it but it seems alot of money from hitchcocks. Bang the iridium plug in mate you can't go wrong. Also did you get the power commander?

[Studigs]

Goes great , found out that you shouldn't leave out parts they supply 🙄  . Put the box they supplied and the air filter and changed to an iridium plug  and now goes like a rocket or a bullet . Only thing I will say is that is a little bit rattley on long trip when hot . Still looking into that .

[BB2023]

Sounds good, I will get saving my pennies