as the title says, how would the syms racing 4-2-1 elh headers work with a classic v4 on a td04/td04h turbo, would it be worth it over porting stock header? apparently they cost £1400 new but i found some for like 200 quid.

http://www.scoobynet.com/subaru-parts-451/880837-gc8-syms-racing-team-headers.html