I have a '13 V8V and would like to put rear wheel spacers on. Any warranty issues with suspension etc?

 

Not unless AM can directly correlate a part failure to the installation of an aftermarket part. I don't see how spacers will affect any part of the car other then perhaps a minuscule bit of tire wear.

 

Instead of spacers, go with a wider wheel/tire combo. V8 Vantage S wheels and tires do make a big difference in looks and handling and fill out the wheel wells better. IMO
Oh, and having been-there, done that with my old 07 Vantage, its not a simple bolt-on process as one might think. The spacers were relatively cheap, the labor was not.

 

I already have the V8S wheels and tires and love them but would like the rears to fill out the wheel wells a little bit more...

 

Wheel spacers=greater/unique/untested loads on original equipment wheel bearings.

Consider upsizing your rear tires to 40 aspect ratio from 35=no bearing load change, but fuller wheel openings.

 

If you get the H&R spacers they can be removed without trace, IF your wheels have the recesses for the studs.

They will generate additional load on the bearings, but that isn't considered a weak point on these cars, so it's extremely unlikely to cause you a problem

 

Here is a photo of my old Vantage with S wheels and rear wheel spacers. Its almost too much for the car… The car did handle very well and I posted my fastest ever time with it at Lime Rock Park last year.

 

It's encouraging that you were OK putting it under (fast) track loads without a problem. Road use shouldn't ever get near that loading, well, Ok, only sometimes

 

"All things in moderation", including wheel spacers.

Follow this self evident truth...you will have no problems.