Just curious, I've got a J's racing 70rs dual and currently running 63.5mm testpipe, will a 70mm testpipe change anything in terms of drone? I love the sound of it now, I am just curious. I've searched around and only found one thread that didn't really help. I know that you should match diameters etc etc in saying that I'll prob end up buying one soon anyways but I'm just interested in people's experiences with this sort of scenario. Thanks

 

Do you plan to tune it? If no, stay with your 63mm. If yes, go with a 70mm and you will see nice gains but without a tune you won't feel a difference.

 

Just did this swap for my 70RS single, there will not be a noticeable in cabin difference.