It'll be louder, though how it sounds depends on the rest of you exhaust system.
For example, until recently I had mine in combination with a standard manifold and a Mx5parts twin backbox- the system was loud and boomy with a harsh boom, though some of that is due to the back box. Then I changed to a 4-2-1 manifold and now the whole system has quietened down with a much warmer tone!
For example, until recently I had mine in combination with a standard manifold and a Mx5parts twin backbox- the system was loud and boomy with a harsh boom, though some of that is due to the back box. Then I changed to a 4-2-1 manifold and now the whole system has quietened down with a much warmer tone!