What are the power gains (if any) of an AGU head on bam block?


New Member
Hi guys, this is my first post. Iv recently purchased an S3 8l, i made sure it was a BAM engine code as i believe these are the more desirable engine. Was looking in the engine bay at the weekend and discovered an 'AGU' stamp on the head. I was at first dissapointed thinking id bought a car which has had an engine swap. After some searching and talking to the previous owner i found out its had an AGU head put on because they have slightly bigger ports.. which leads me to my question.. how much (if any) of a difference will this conversion make? And is it really worth it? Thanks in advance :)