The TODA headers are not 'better' than the Spoon headers... If you were to purchase a B pipe and N1 muffler, it would be easier to just get the header as well.

I have seen extensive testing from both, and the Spoon header produces more overall power. The TODA header produces slighly (~2hp) more horsepower at the very top rpm. This is based on a DC2 Integra type R. Both offered SUBSTANTIAL gains over standard. The TODA header also had the best ground clearance.

I also have information on the N1 exhaust that you may be interested in. From memory, the N1 emitted 124db (!!) on drive by sound testing, compared to 96db for the stock twin muffler system. This was tested on an S2000. Most other aftermarket exhuast systems in the test recorder around 103db.

With the silencer in place, noise was reduced to 116db.