As the title states I have a bnib genuine bmw ///M performance exhaust to suit a 535i.
This oem item simply clamps onto the existing exhaust system (you cut the oem mufflers off) and shall not void your warranty being a genuine item (best to discuss with your dealer SA).
It comes with ///M engraved tips:
Price
Location: Newcastle NSW (can post australia wide for ~ $45)