So I have my RRS HSE on order for September delivery and with evrything I have read about the sound system I am thinking of trying to upgrade.

Am I too late to add this?

Would it be worth it or will the stock unit be ok? Currently have a 330m sport with Harman kardon system so want something similar as like to turn queen up 👴

Any advice would be great 👍

Usually 3 weeks before build, but contact your dealer in case the build date you have has come forward which does happen frequently and the dealership "forgets" (read can't be a*sed) to tell the customer that their order is now locked in. The stock 380w system in the HSE/HSE Dynamic isn't the greatest but not too bad. The cars used to have the 850w as standard which is much better, but whether or not is worth £1000+ extra now it is the optional system .............I don't think so. The really high end version is fantastic but again not worth what LR charges for it. 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

Paulmoz10 - I also have a rrs on order for September delivery and want to add an option, did you find out if you could change your order still?

Your dealer should be able to give you this date. Mine gave me a printout from the Vista 2 system that shows you the timeline from ordering to delivery. One of the milestones listed is Last Date for Spec Change.
It also listed all of the options I had ordered so I could double check that everything was correct.

I was given 2-3 weeks to make any changes after order was placed