Our factory options are the 2003 and up saab unit or the lnf.
For a t3 setup we have zzp**, hahn, jgs(lotsohdollas), spa?*....anyone else?
ZZP also sells an exhaust flange for welding your own, anyone else?
**https://zzperformance.com/ecotec/exhaust/ecotec-stainless-turbo-manifold.html...