Stephan,
I just read your build log and wanted to comment on the reply above that was posted some time ago. I built a LS3 CT525 powered 1977 280Z with a Harrop Hurricane cross ram intake with 58mm throttle bodies and it worked flawlessly. LSX Performance Tuning (
The Guerra Group ) had my car for 1 full day and when I got it back it drove like a high performance car from the factory would drive. The engine idled correctly, cold start worked as it should, highway cruise was smooth without any surging and wide open throttle was great but the smile on my face was hard to remove. My current GT40 build has a Borla Induction intake with 58mm ITB's and puts out over 625hp at 7,500rpm's without any issues either. Just wanted to defend Harrop since they make a great product, maybe the tuners need to talk to the guys at LSX Performance tuning for some insight.
Rick