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The loss of power is due to not having had a re-map, so if you get it mapped you will see the increase you were looking for.. With your mods I'd expect the increase to be closer to the 20 than the 30 bhp mark, and that would be at the flywheel, not the wheels. Leave the OEM manifold off, it will be better built than the Japspeed but the cat will restrict massively and you would have wasted £800 on a map with little gain..