i personally think untill such time a new plenum is designed we are all going to see inconsistant power and torque figures. as mick underlines no plenum seems to be the same, they seem to have left the factory with inconsistant figures, and this seems to be showing on the rollers, and final in the figures after a re-map. untill a plenum is designed that will give a 180 a consistant power and torque figure this will always be an issue and a talking point. it also puts a big bold line under how bad the origional/standard plenum really is
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Astra GSi turbo
Regal Autosport Astra GSI Turbo 304 bhp 356 lb/ft
Thorney motorsport Vectra vxr 305bhp 398lbft
Now its time to build a big turbo MG ZS
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