Sounds like a normal improvement for those mods as I understand. To me headers are a great mod for several reasons, not just hp. They sound good, look nice on your engine and oh yeah add hp.
I was a bit disappointed on our dyno sheet for our LS2. I had taken a Friday off work and drove to Dallas from OKC to get the tune. They had the car most of Friday and I picked it up Sat morning.
We didn't get a before run because he said they didn't have time which didn't sound right but they were busy and they didn't get paid for the tune since it was donated (but I don't think I should have been shorted because of that). We installed a Killer Bee intake and the LG long tube headers and we had put on the NPP's last year. We ended up with 345 rwhp and 359 torgue on a Dynojet. Honestly, I would have thought 345 would have been more appropriate before the mods.
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