Well I was browsing the web and found this: http://www.dynaonline.com/skins/products/automotive/arc_2/

and searched a bit to find out more. I found on dsm-tuners that it is PnP on the 4g63 but can't find anything about the 420a.

All the GST/GSX guys loved it and said it was more reliable than msd. And it's a lot cheaper too!

Well I emailed dynatek asking about the 420a, I will let you know how that goes.

I wanted to know if any of the members here have used it or know something about it. Thanxs in advance....