random bit on my backbox

[DEX]

this is a non toyota question. but my hks exhaust has got this random bit on it just before the backbox anyone know what it is for? i want to remove it but want to find out for sure what it is/does before i do.

 

[dac69er]

a resinator box maybe?? never seen a setup like that before. is there just the one pipe going to that other box???

 

[DEX]

yep just the one pipe leading to the box

 

[nutta]

is it a straight pipe that goes all the way from the front to the rear with no other boxes in the pipe anywere?