Some owners don't need a big catalyser, or another silencer (SDCP) - just the best power/torque AND best sound!
This combination of stepped 4-1 manifold with a properly merged collector, fully TIG-welded connected to a plain/lightweight de-cat pipe, is the best solution for Track or Race.
Best choice for race cars.
We suggest to use new exhaust manifold nuts available here.
If your exhaust studs are damaged or corroded new genuine Toyota are available here.