Many of these are installed alongside fabrication and welding work, which is why they sit in this category.
Fitment is the specification that matters most. Parts are specific to make, model, year, engine and sometimes trim level, and a part that fits one variant often does not fit another. The product listing should be checked against the vehicle rather than assumed from the brand or the description.
Material and construction determine durability. Aluminised and stainless exhaust systems last far longer than mild steel; mandrel-bent tubing flows better than crush-bent; polyurethane bushings outlast rubber but transmit more vibration. These are trade-offs rather than improvements.
Performance parts change the behaviour of the vehicle and often need supporting modifications. A larger exhaust needs a matching tune; stiffer suspension changes the alignment requirements. Buying the part alone without the supporting work is a common and expensive mistake.
