Wish I could find the link to that race Guzzi, I think it was a Spanish team that operated it.
It had the exhausts coming out the sides and if I remember correctly, belt drives, it produced a Ducati challenging output
I seem to remember years ago it went up for sale at a pretty eye watering price, but you'd also have needed your own machine shop to keep it running
IMHO it looked awesome
Possibly somebody else may remember it