I have a China built 535 Li Executive edition and am going to do sport springs with Alpina wheels, Alpina front and rear spoiler and some power tuning. My question is actually two. Who has a good quad exhaust system which is NOT too loud or boomy. The car is too quiet now but I don't want it a lot louder, just liven it up a little. The second question is about the rear valance for quad exhaust. Who has a nice difuser to accomodate quad exhaust?

Li models need a custom built exhaust. U need to find a local shop.

On a side note, we are planning to open our second branch location in Shanghai and then Beijing one year after Shanghai opening. Please stay tuned.