Freelander 2 (LR2) exhaust

Hi i am looking to have a new exhaust on my FL2 and i,m thinking of going stainless steel.Would there be any gains in having a free flow after cat one fitted.I have googled it and got different answers.Is there anyone thats had one fitted or anyone know if theres any advantages with the free flow SS fitted ??/

There will be a marginal gain in torque. However a majority of pumping losses will due to the DPF or cat.