Star-Orion

Which companies header and exhaust has the most power. I'm thinking going with Mugen. Can anybody tell me how much hp and lb-ft I can get from Mugen header and how much hp and lb-ft I can get from Mugen exhaust at the engine or the at the wheel. But if the power is at the wheel how do you calculate the power at the engine. I know the S2ki lose 18-21% of power at the wheel. I'm getting my S2ki on March 23 2001 car.

Utah S2K

Use the search function and check it out. There's a ton of previously posted data on this topic. This will include Dyno's and all else you could want......personally I'd get the HKS if you can take the noise.