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IMO this is about right for a full street exhaust of ANY BRAND. Anyone who does not pick up significantly is probably in need of collector extensions and/or jetting/timing changes or just isn't moving a lot of exhaust-aka not making a lot of power.

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So you're telling me that a muffled street car should drop 2 tenths just by dropping the exhaust no matter what kind of exhaust system they run?

I tried 2 different lengths of collector extensions and tried re-jetting up and down and timing and could not get the car to run quicker with open headers, that made me very happy so the exhaust never had to be dropped again.

You might be right that the headers may not be perfect but who's gonna try a bunch of different headers to try and beat the times you turned with your exhaust system. And at 134-136 MPH I think that's decent power for a street car.

I think a good exhaust system will not slow a car down.