[christianchevell]

GMPP cnc factory ported heads come complete with hollow stem intake valves for around $1300 a pair no core new, that's what I went with for the price because it can not be beat. If your thinking your going to gain so much more with heads your going to spend a way lot more. DOne up with the 235/239 you should kick 500 rwhp on a mustang and about that in torque, now if you want to go into intakes the only deal is FAST with a 102 TB for really whats out there unless your doing a more race car then you could go the long runner tunnelram type high/midrise and they show some number gains yet are not the best down low like a tunnel ram is and are not phenolic resin . The FAST does better on a larger than stock cube size ls3 , or you can go really spendy with small bore ls7 heads and a MSD airforce intake. If your just interested in numbers the money does go way up. Hollow stem intakes are better than the solids on a L99 head and the engines have a higher redline..gotta run.