Petrol cars: Car manufacturing companies are producing cars nowadays with very small engine capacity for tax and environment reasons. They also use more filters in the exhaust system and all these changes will lead to a too well-behaved sound.
Diesel: Diesel cars, especially turbo charged diesels, do not create a brutal sound on their own. Xhaust will give your diesel the right sound and make it more attractive and special.
Hybrid: Most Hybrid cars have very small engines and therefore the original sound is very weak. Xhaust will solve this problem for you.
Electric: Electric cars do not have any exhaust at all and that creates, in some cases, a safety issue due to the silence of an electric car. Most electric cars are very fast but without a nice sound the driving experience is not optimal. Xhaust will solve the safety issue and give you a better driving experience.