The DS system I had ( yes the later one with bigger silencers) made it unbearable in the car for drone. Backing off made your ears bleed. I bought a Ferrita system from Kalmar Union and being Volvo people they know exhausts. The difference was unbelieveable. Its quiet in the car, but give it beans and it sounds great. The only downfall is the basic round tips on the back, but thats a small price to pay for a system which has been great. I was worried about fitting a new downpipe and sportscat for increasing the noise, but has been fine as well.