Can you install 2013 axleback on 2015 brz?
 

One of my friend says the lay out of the 2015 hasnt changed from 2013 so i can find a 2013 or 14 axleback and install it with no problems...is this true? just wanna make sure before i do anything and does it void warranty if do axleback?

Yes on the same, no on voiding the warranty. Anything other than headers is generally considered fine for warranty purposes.

thanks man !!