Did this mod about 3 weeks ago. Pleased with the results so far. I would say it's most pronounced during a cold start and when revs are just under 3000.
Keep in mind it's the same exhaust system, so you're not going to hear something completely different and it won't be loud enough to wake up the neighbors. It's about 10% louder at low RPMs.
I did notice that my left exhaust tip now has soot, it was sparkling clean before
Enjoy! I recommend it
