BBK long tubes collector size??

[90lxboost'n]

I bought a set of long tube bbk,s 1,3/4 in. I am wanting to get an X pipe and need to know what size to get for the ball collector to fit. Thanks for the help guys..

 

[Grn92LX]

The collector is 3" and necks down to just over 2.25". Its very small especially for 1 3/4" primaries. I opened mine up to 2.75" and i'll be fully opening it to 3" when I go to a 3" X.

 

[aleborjas]

2.5

 

[Grn92LX]

2.5

No.

The collector is 3" and then necks down to just over 2.25" at the ball/socket flange. I've measured