Whats a cat or decat pipe? I thought the spoon b pipe had that already? if i get a different header like spoon or fujitsubo header then i wont need that dcat pipe anymore?
No mate, ALL cars need CATS/ DECATS
Thats a Silencer on your B Pipe, not a CAT.
It goes in this order from front to back:
Manifold
Decat or CAT
B pipe
Back box / muffler