thought your TTI headers were expensive?

I stay far away from M cars. They require ridiculous amounts of money for maintenance, and any unique parts for them multiply the cost by several times... like the header in your picture
I had a 2000 M5 from 2009-2020. I sold it last fall to make room for my 73 Cuda. I didn't do too bad on it. New it was $73,000. I paid 13.5k with 104k miles on it. Put several grand into freshening the suspension, two sets of tires, brakes, and a Dinan rear diff. I did all the work myself, including rebuilding the VANOS system. I sold it last fall for 10k with 140,000 miles. I think I got my money out of it. 420hp six speed manual that handled like it was on rails. It's the goal I have set for my Cuda. Should get close but the chassis will never be as stiff. Mopars are expensive, but not M-car expensive.