I FAIL Inch vs Metric
 

I ordered elbows for my Header built and looks like i fail very hard

is
1.33 inch

too small for a 1.8 8valve engine? or is it still OK compared to an oem Flowbrake Header?


I hate it
always reading here about inches not MM


why americans cant use the standart of the rest in the world?

1/2 in =12.7mm

Try a program called Convert it's free,capable and only needs to be downloaded to your desktop not installed works for most weights measures you will come across.

tons of free converters on google