The best way u can help is not give out bad info.
Geeze, what are you all butt hurt about anyway?
If you go back and re-read my posts I stated some manufacturers have direction louvers and some don't, I was very clear about that.
So I did the research to help the guy that posted to find out the facts for the specific mufflers he had.
I bought a set this year they was not marked inlet and outlet . And yes mine sound just like I remember 60 years ago ....I've got to get used to every time I put something on this forum somebody always wants to beat me up..
So I think I'll keep my opinion and what little knowledge I have to myself .... and just read ....
That would be great, maybe you could be one of those guys that says what he means, and does what he says?
That would be great!

John