I know both cars and both drivers personally. The exhaust company belongs to one of them. I have seen and heard the street legal exhaust for the 1M, but not the race exhaust. I have seen and heard their titanium exhausts both for the GTS as well as the CSL. The exhausts they build and sell are all beautiful craftsmanship and sound gigantic (the street legal version for the 1M not quite as gigantic... it's legal
)! I have already sent them a link and have asked them to answer to this thread. Afaik they are in the final stages with the titanium race exhaust for the 1M, so give them a couple of days. I'll message them again and see if I can get any additional info.