Dual exhaust systems have become more common in recent times and are in most cases accepted by manufacturers for aesthetic and performance reasons. For owners looking to improve their exhaust and car performance, a good after-sales exhaust system is one that enhances performance and gives the car a more aggressive touch. You can easily buy the high-performance dual exhaust systems from various online sources.
However, as buyers became more sophisticated and knowledgeable over the years, manufacturers were forced to offer more powerful cars with each new iteration. So cars like the BMW M3 have started to have quad mufflers even when the M3's engine is an inline-six.
Below, a dual exhaust system is powered by three exhaust pipes driving the silencers with dual exhaust trims at each end. Viewed from the rear, the 2006 M3 has four exhaust pipes. In terms of performance, a quad tube isn't really as necessary as an appropriately sized outlet. But there is no denying that the quad muffler looks very aggressive and sporty. Starting with the V8 M5, BMW also thought it would be best to equip this fast, high-end sedan with a dual damper layout and four exhaust pipes.
Due to a large number of vehicles available on the market, it is not possible to recommend a general combination of lengths, diameters and types of silencers. But it's possible to get better performance and an interesting exhaust note. Don't rush to spend your money, hang out or go to events that showcase products that interest you. Then do a little research online while narrowing your list down to a few choices.