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Got to agree with Dave here.
No engine breathing hot air will make decent power.
As Dave rightly says, nasp tuning is much harder than turbo.
I spent many hours on a rolling road with a zs 180 so i know what does and doesnt work.
No zs 180 will make 198bhp without decent air induction system and cat back exhaust.
As a matter of precaution, we would do a health check on any car we was tuning before any mods took place. The zs needed to be 100% healthy to start with or it wuldnt give the gains.
George
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