Not meaning to start an argument but yes I have dealt with them before. Had running problems about 5 years ago and I got a long and lengthy sales pitch from someone at RPi on the benefits of Magnecor leads and why a RV8 cannot
possibly run well without them. Then why I
must have an RPi power amp to run on LPG and only then would they be interested in helping cure my misfire
TBH within 10seconds flat I was getting talked to like I had no idea what was fitted to the car and that the person on the other end knew more about the problem having not looked at or heard the engine running!
Fact is that ultimately the rocker arms and cam were knackered and all those bits would have not made one jot of difference. Not saying for a minute that they are not capable of good things, however my experience and that of several others I know are of vastly overpriced products and no help at all when you have a problem with things you buy from them.
I know of 3 people who have bought followers from RPi (usually as cam kits) and when starting the engine up they rattle and tap like crazy, phone up RPi and get told "oh no it's nothing to do with what we've supplied" and the phone gets put down on you. They would not admit to having quality issues with parts and getting a refund was like pulling teeth.
So personally I am not really a fan!