+4 PSI is the most we recommend for stock cars to keep it reliable. on 93+ you can go up to +6 PSI
You can E30 with this tune. If you encounter issues with misfires or fuel delivery, lower the mix to E20
Regardless of the downpipe, you do not need a tune. Most downpipes will throw a check engine light, the car will run fine, it's only a warning.
I recommend you get the Active Autowerke catted downpipe, it does not throw a check engine light...
Currently, all MST products are shipped directly from them, they are not offering any stock to dealers due to the very limited supply. MST orders take on average 2 weeks
We have the inlet + red charge pipe in stock (only 1 left)
FTP BMW G20 B58 3.0T charge pipe ( A90 supra) - Extreme Power House (mybigcommerce.com)
FTP G20 B58 intake pipe ( A90 Supra) - Extreme Power House (mybigcommerce.com)