So I received my RJWC xmr duals last week and finally got around to installing them. The fit and finish is great and so is the sound.
As for a tuner RJWC says you must run one. I don’t have any engine mods, Just a filter and now a exhaust, so I’ll be running a Fuel programmer with a base tune.
Just waiting on a waterproof box to come in to protect the tuner from water.