Gatesy,
I did a long and extensive search on that subject prior to purchasing mine.
Here is a post with an email from the manufacturer (Boulekos) saying that the A2 is more geared towards the very High performance AMG engines (not the SRT6 which isn't considered one of the 'monsters').
Read it and make your choice - if it comes from the manufacturer, I'll take his word for it.
Feel free to contact them and ask for your own sake. Let us know what you find and what you end up going with.
https://www.crossfireforum.org/forum...light=boulekos
http://www.sprintbooster.gr/gr/
SQ