We think 2.2S rods are a bit heavy - I am sure many people will disagree and I think Woessner rods are very good but relatively expensive.
We have just finished a 3-D model for some rods and have done the FEA analysis for 8250 rpm assuming 1969 911S Mahle Piston Weight.
They are being made in Sweden form 4340AQ Forgings are fully heat treated, shot peened etc, etc. and have ARP 2000 Bolts as standard and Aluminium Bronze small end bushes.
We have machined grooves to allow oil to the piston crown to try to avoid fitting squirters in early casings which I believe contravenes FIA rules.
The weight indicated by the model is 540 gms.
We plan to use them in a couple of FIA Appendix K Period F 2.0 litre engines.
I will try to post photographs when they are completed.