E46 M3 CPI Headers Tuning

Retuned a car today that we had done a dyno tune on a few months ago. Car has Dinan Intake and throttle bodys and catback. The below graph shows pre/post tune on the car.

Bmw E46 M3 CPI Test

After adding the CPI headers and returning to the dyno this is the difference with no tuning changes. Notice the significant low end loss.

Bmw E46 M3 CPI Test

These are the changes from tuning after adding headers

Bmw E46 M3 CPI Test

And finally the progression from beginning to end. Stock, Tuned, then Tuned with headers.

Bmw E46 M3 CPI Test

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