DPF-Back Exhaust Systems
In recent years (2017 onwards) many aftermarket exhaust manufacturers have been designing DPF-back exhaust systems for diesel vehicles. As the name suggests, these systems replace the section of your stock exhaust that runs from the DPF or diesel particulate filter back to your tailpipe.
In terms of performance gains and exhaust note, these systems are largely in-line with a cat-back system so if you’re looking for impressive increases in bhp or top speed, you’ll probably want to consider a turbo-back system instead.
What About Resonated Vs. Non-Resonated Systems?
Resonated systems use special mufflers and baffles to reduce the noise level of your new exhaust, while non-resonated systems generally produce a louder, more aggressive exhaust note. This is largely a matter of personal preference and there’s no right or wrong answer here, but it’s always worth considering whether your main aim is to increase the performance, aesthetics or acoustics of your vehicle.
Turbo-Back Exhaust Systems
Turbo-back exhausts replace everything from the turbo down – including the downpipe. Since the downpipe is normally the most restrictive part of a stock exhaust system, turbo-back exhausts are the first choice for people who want to see serious performance gains.
But they do tend to be more expensive than cat-back systems, which makes sense when you consider the fact that they’re replacing everything a cat-back system would replace the plus the additional section that stretches back to your turbo.
Cat-Back Exhaust Systems
Cat-back exhausts replace the portion of your exhaust that runs from your catalytic converter to your tailpipe. Cat-back exhaust systems do offer some performance gains but they’re usually marginal and dwarfed by the gains provided by a full turbo-back system.
What cat-backs can do is significantly improve the sound your car emits. Cat-back systems also tend to be cheaper and easier to fit than a full turbo-back exhaust system which is why they’re generally the most popular type of performance exhaust.