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it's complicated, it shares the same centre section with the race system (2.5inch)
the backbox is where we knock all of the sound out, i wouldn't suggest using it with a turbo, go for a race system, with a turbo it'll be quieter anyway
your in cov? i've got 30 of them on the shelf if you need one you can grab one off sam, he lives in cov
we only use genuine, nowt wrong with bosch, mann etc, i just like genuine for the warranty