ON racinging beat's site, it says 3 inches outside diameter, greddy says their sp2 is 60 mm but does not say whether they measured inside diameter or outside diameter.

Does anyone which one is bigger by inside diameter?

Thanks

Chris

 

Greddy is the biggest tips out there. The below thead has photos.

https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/racing-beat-greddy-sp2-question-63714/

 

tubing is always measured by OD 3" = 76.2mm

3" is overkill on anything other than a high boost turbo setup

 

thanks guys, lschivo and I are having some horse sounds on both of our turboed 8's. We both are running stock cat and RB exhaust but fanman is running the same with no horse sound. We have heard that the exhaust may be causing back pressure and making the horse sound under vacuum when the BOV will not vent. Adnusting the BOv yields no results. So i guess the question should be which exhaust has the least amount of back pressure, i would say . . RB cause overall the pipes are bigger, the tips do not make that much of a difference right?

 

right the tips do not make a difference.

Except looks.

 

the tips can be smaller still because you split the flow in two

 

Does anybody know the tube diameter for the Mazdaspeed exhaust?

and yes... tips do not matter... just for sound/looks.