20.5-24 Turbo Pipe

[jcjc1]

should be easy to determine by looking at a pre 23 head with those made after by seeing if the spark plug location changed as the vid alleges.

 

[snoflake]

Yes that is what post 1 or the entire thread is about

That's kinda why i was asking. There is one post about it making power, when normally 20 HP for $1000.00 and its headline news.