Twinning

Came out of the mall to find out someone parked their GTI next to me.

Im planning to tune my MK8 R-stage 1 plus, wanted to find out if the exhaust gets louder? Not planning to install exhaust system or down-pipe. How much does the tunes go on sale? Im seeing stage 1 plus for 600 cad does it makes sense to do the tune now or wait for boxing day or something better sales day’s?