I’ve seen many posts about the BNR headers for the 1.8 and after checking their site it seems that those don’t exist? At least not anymore. Are there any out there for the 1.8 or any that someone could recommend?
I scoured on the internet and found the headers for the sonic it's a 4to1 stainless steel header and all mounts are the same it's for a Opel/Vauxhall Astra H 1.8L (Z18XER) here's the website, they also make low pressure turbo kits as well for the ecotec 1.8L. It's a aftermarket french company that does opel parts https://strperformance.com/en/opel-...eel-exhaust-manifold-z16xer-z18xer-04-16.html