RT put one on my STi when doing the tune. They said it was worth doing and gave me some details as to why.. but the best thing I like about it, as Joe has said, is the induction noise - sounds sensational now, nice induction note and you can hear the BOV easily too..

Cheers
Zombee

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2017 Ford Focus RS
MY11 STI - SOLD

I spoke to Steve at MMS today & a good one is worth up to 15kw but they also cost about $1,500

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Beaten up old 98 Gen 2 Liberty, 13.0, stock V3 STI running gear.
07 Transit motor home
69 VF & 70 VG Valiants needing full restoration
Yamaha Zooma 50cc rocket hopefully going with the Transit.

the homoligated group-n one is $1500, most of the aftermarket ones are near identicle replicas

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Long live the WRC