why dot some car manufactuers need such a big engine to get a certain amount of power?

Toaster

New member
i was wondering why some car makers use such a huge engine size to get a certain amount of power, while other car makers can use a much smaller engine and get about the same power. ..for example a
Ford mustang cobra costs a more than a subaru wrx sti. the mustangs engine is a V9 4.6L engine and goes 0-100 in 5.6sec. the subarus engine is only a V6 2.5L and does 0-100 in 5.2sec..that was just an example of it..im not saying any car is bad or I dont like any of them ....sorry if I offended anyone but ya know...
but..why is this?
 
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