Will it make the car perform better with a header and piping change will leaving the mufflers stock? There will still be exhaust restrictions at the mufflers. I don't think doing that will have any performance gains, but I don't know enough about these things cos I've not done a full IHE change.
The FGK exhaust AusAccord has is I think one of the quietest full catback systems based on a video I saw a few years ago. We have a thread on exhaust db levels
The Absolute ECU would have been tuned for the performance JDM (200bhp) K24A which has different internals to our economy K24A6 (160bhp). So getting the ECU without the engine is going to be a waste of time. HKS bolt on turbo kit for the Odyssey is the simplest way to increase performace.
Don't think KPro will work on our car, mostly I've seen Unichip Ver Q being used. From what I have heard Unichip+Exhaust+intake change will only increase HP by 15-20. But all this is based on reading what other people have written in forums.
Old man that drives slow cars 
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