Hi, all my fellow MX-5 lovers!
Greetings from Portugal!
First of all, I would like to apologize but my German is extremely basic. 
I'm new to the forum and I'm considering buying the ATH quad pipe exhaust for my 2.0L, 160hp, RF, and this forum seems to be the best source of knowledge for this.
I've read through the entire topic (with the help of google translate), but I'm still not sure.
I love how it looks, but I'm afraid it might be too loud. I would like that until 3000 rpm it wouldn't be too much louder than the OEM exhaust, between 15% and 25%, no more.
Above 3000 rpm I don't mind if it's louder than that. Some exhaust burping would be a plus. 
So, for all who have the ATH quad pipe exhaust, how much louder would you say it is, when compared to the stock OEM exhaust? 15%? 25%? more than 50%? 
And do you recommend that I go for the VSD immediately or no?
Thanks!