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Itg
I am biased as I run one on the race car.
However the ITG is the only filter that has been designed for the ZS180, the shape of the filter box and intake pipe are designed such that even air flow.
Back to back rolling road showed 8 bhp inprovement on piper venom closed induction kit.
Yes they are expensive but they are the best bolt on for performance.
Thats one of the reason why MG Sport and racing got them to make them as they are the only aftermarket kit that was a factory option.
They also work well on 1.8 engine all the MG Sport and racing ZR190's used them as standard.
Clearly for improved induction a standard come is a good step and inner wing set works well. However for all out performance ITG can not be beaten.
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