Headers = tune
A few degrees of timing in the right spot will also help the overall power curve.
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.. I say, if your not doing anymore work to the car in the next six months then get a tune. If you are, wait, then get a tune. A tune will help everything -- its better for the car, better for D/D, better for track times.
--There aren't any downsides to tuning except for the money, but if you own one of these moneypit cars then you either have to get past the money part of it or stop modding, sell it, and buy a
yoshiwawa
or something The Best V8 Stories One Small Block at Time
I also shaved off 7 tenths of a second with tune, headers, Ory and better weather.

