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I've never had a problem with a stock ECU on ANY application (Lotus, Celica, Matrix, Corolla or Vibe). The reason is that the lengths are all what the stock ECU is tuned for, this just fixes the production problems with the header.
I can't speak to cams plus header though.
The dyno we did on Jay's car was AFTER he had had the header on for over a week and it still showed over 5 HP in gains.
The bad news is that I'm still waiting on my header porting tools to come back from my friend in New Orleans, and I'm way backed up with the intake manifold stuff and some head work and engine builds, so I don't forsee getting to any header for a little bit.
I am working with a local friend about the possibility of training someone here in Houston to do them for me.
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DD Performance Research
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