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i think if you keep the origional manifolds it passes the mot as it has a pre cat attached. if you change these to aftermarker manifolds the pre cat goes. can somebody confirm this or correct me please
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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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