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After having completed the switch to CSL euro headers and a euro section 1 (cats), I'm very pleased with the result.
I followed the videos re relocating the o2 sensor wiring and had "just enough" to get it done. While there, replaced the sensors and, after about 200 miles, no codes what-so-ever.
It might be slightly louder than NA stock, definitely a bit lower frequency.
Noticeable performance increase.
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