I have the same problem. Last year i did 425 at houston with jammer 4's, drag comp, 64/14 from gillette diesel. This last year i did 459 with HRVP from II, 10holes with lift, same turbo, head work, haisely street puller cam, juice w/ attitude, smarty, FASS. I was very dissapointed to only gain 29hp will all the new mods.
But as u know i fixed the damn thing and she be screaming now. My map sensor was not throwing any codes and when i replace it she came alive. 565hp. Like i said i have the new high hp map senser and it netted me a 106 hp along with the new silver 64.
What did your hp and tq curves look like????
I am going for 650 on fuel only next time.
It was nice to meet you.