if its a 180 its proberly the plenum. budget £500 for this.
none of my 180 have been tappety when cold. or hot.
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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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