Couple of questions.
Who is doing the tuning?
Did you change the rest of the exhaust system, or just the headers, and high flow cats?
Do you have an oil cooler? High oil temps will pull timing. It starts around 240F.
What was the temp and humidity that day?
The Nismo oem exhaust isn't much better than the base exhaust. Only a little louder. The Nismo R Tune isn't much better either.
The DC headers are shorty headers. So don't expect much torque with them. LTH's are the way to go. Either FI or PPE. Followed by the Z1 shorty headers. You're the first person on here to run the DC headers.
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