Isn't it 350 400 500 750 800 I don't think there is a 450 but I could be wrong
CM doesn't list the FX450, it is one of the custom setups I have CM do for me and I sell on my web site. The FX450 uses a Feramic material on either a 6 puck or 4 puck disk.
FX450 Feramic (Stage 4.5)
- Heavy-duty street & racing system
- Holding capacity 200% over stock
- Heavy-Duty reinforced pressure plate
- Hi-Leverage pressure ring design
- 4-button or 6-button
- Feramic friction material
- SFI Approved on most race applications
Rated for 635 ft lbs
I have done this setup for plenty of B5 S4 customers that are pushing their stage 3 turbo setups hard and didn't want to go with a twin disk setup, have also done some for 1.8t customers.
As for your list, there isn't a 750 or 800. You are most likely thinking of the 725 and 850 which are twin disk setups and I also offer a 850 Super Single which CM also doesn't list. CM used to list the 725 as a FX600 and FX700, but now just list it as a TD725.
Here is a picture of the custom Golf R 850 Super Single I offer which CM does not list on their site or catalog. This one is going on a Golf R that is being built for 600+whp.