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If you can i'd get these welded on before you put the headers on. They will save you a lot of time in the future if you have to pull the ypipe off to do your shift kit or pull the tranny.
If not then just get these.
And ya you need 3"
The slip fits are ridiculous to get off. Ill be doing V Bands when I redo my exhaust. FWIW I have Band Clamps on there right now.