Check here:
https://www.tamparacing.com/forums/h...directory.html
I would ditch the greddy piggyback & use aem ems as mentioned above.
The greddy kit maybe a limiting factor for your setup.
If done right a setup can flow really well, example: I recently tuned an s2000 with a completely stock motor with a kit the customer put together him self. It made 380 whp at 10.5 psi on a dynojet.
Good luck.