It looks like hes just trying to show you how much of a savings hes giving you by selling them for 70 bucks. Hes trying to pull a fast one. I bet money the z1 are on his car and swapped them out for these. BUT, i have these ebay/amazon one on my car and they work. Their just pipes. Unless you need the extra 02 bung (usually the supercharged and turbo cars need them tuning) if youre n/a you're fine.
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