Hey there, i had the same problem about 2 months ago. I had just picked up my car that arvo from Racepace after having it off the road for about 4 months getting one of their stage 1 motors and i got pulled over for a breatho. Anyway i got a full EPA in the mail about a week later. The car had,
-5 turbos
wayy loud 3 inch exhaust with no cat
700cc injectors
PFC
044 fuel pump
apexi pod filters
cam gears
I ended up just putting the stock injectors, ECU, cat converter and i really bunged up homemade cat back i had made up on it and it passed. The hardest thing to try to get is the car under 90 dba on the noise test.