currently there are so many after market parts.ranging from 400++ to few thousand..
ther r a lot of brand
local-jasma
japan-tanabe
usa-apexi,hks,
and so on..
this is my car spec..
v6 twin turbo.
with 3 inch dia'.pipe
try using 3 inch frm tanabe-frm chop shop.
i find out its too...