Just be patient and take your time. The plastic lock clips that hold the mudguard in place are a bit tricky to get undone. You need to remove the right mudguard from the front bumper right back to top of the wheel arch to get the resonator out easily, otherwise access to the resonator is frustrating. It's not difficult to do, just fiddly. Send me PM if you need a hand.

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MY07 STI Tuned WRX ( 117/200 ) WRBlue