Yes performance wise also sound
Unless your centre muffler is "cactus", it's a waste of time, and may render your vehicle unroadworthy, depending on your laws, the droning noise inside the vehicle will send you nuts on a long drive and all this for no, nill, nada, nought performance gain, but by all means give it a go if you must.
Law of physics, "percieved performance increases proportionally to the amount of noise emitted from exhaust".
 
Bought some m8 bolts sprayed abit plus gas on old ones popped right off 30 mins start to finish. It does sound nice :)
 

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