Since you had problems comprehending the wiki link I will quote it for you:
The exhaust note is basically a throaty growling sound with some popping. The 45° design of the engine thus creates a plug firing sequencing as such: The first cylinder fires, the second (rear) cylinder fires 315° later, then there is a 405° gap until the first cylinder fires again, giving the engine its unique sound.[99]
Thanks for providing that explanation of the reason it has that plop-plop,plop-plop sound.
But the firing sequence is cylinder 1, then cylinder 2. Is this not correct ? How could one have a ‘different’ firing sequence?
That is why I asked you what you meant by firing sequence, because it seems obvious that it means something different to you than to most people.