Intererested to know if anyone has a rough idea of the power upgrades to 206 XR and GTi models

2001+ XR/XT 80kw
a) air filter
b) new exhaust
c) powerchip

2000+ GTi 100kw / GTi 180 130kw (correct if i'm wrong)
a) air filter
b) new exhaust
c) powerchip

Also, what costs can I expect to incur for a new exhaust system?

Thanks in advance

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