Has anyone installed these?
https://x-ph.com/vrsf-3-stainless-st...mw-535i-535xi/

Similar sets sold on ebay for about the same price.

The price has gone down on the AR Design models but it appears the company went bankrupt so not sure about current permutation of the product.
https://www.n54tuning.com/ar-design-e60-downpipe.html

 

I just purchased a set of the AR designs from N54tuning earlier last week. Vendor said they were 1.5 weeks out today so hopefully will receive in early Feb with any luck.