My buddy has the tr224 in basically stock 02 ws6. So it has the ls6 intake but still the stock lid and exhaust manifolds.......we are goin to put headers and lid on the car sometime this week. How much hp should he gain from putting lid and headers on an already cammed car with 3 inch true dual set up?

 

cam headers lid should at least be good for 350-370 rwhp if not more