Is 10 HP about the max a chip will give the V8? Anyone done any exhaust upgrades and dyno the difference?

My first Dyno was done on a great dyno day and the 2nd was done on a very hot and humid day which could account for why i didnt get as much as I think I should have.

<img src="http://dejong947.com/dyno/both_on_one_small.jpg">

as for chips. STFA there is lots of comentary on that.

But yea, cat-back is 15HP/20torque at whees too, according to Strat.

Strat's numbers should be somewhere around 15HP/10-15T.

Once I pass 2000 miles on the system I wanna do another. I think I can break 280 easy.