If the moderator allows Id like to invite each of you to the Lexus RC-F Owners page on Facebook. We have over 1300 worldwide owners of F performance machines and a well vetted list of retailers and manufacturers in the group.
I will advertise this...
Thank you for your service Marine.
If you want subtle then a 2ndary cat and resonator delete is the best. But thats what you will get, maybe a 15 to 20 percent increase in growl.
I did this and a week later installed a Borla catback.
It is mid range at idle and neighborhood speeds but wakes up...