Legacy B4 help
 

I have a legacy B4 year 2000
Can anyone help me with information as I am struggling to find a decat system - lowering springs and dump vlave?
Are any other models compatable with the Legacy B4 - EG does any other impreza exhaust system fit the legacy? are the intercoolers the same for the dump valve? are all the lowering springs different?

I appreciate any help and advise you can give
Thanks
Chris