I installed full 3" (including 3" elbow from turbo) It was very very loud at first.
The whole system was custom made, and only had one resonator and large (kinda cheap) muffler.
I have since had a further resonator installed, and am looking at a good quality sports muffler.
It sounds awesome when ideling, and when you give it heaps on motorway... but it gets very annoying after a while at around 2 - 3k rpm. Sound is a constant drone...
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