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So far here in Team Nissan in Oxnard, I haven't had any issues. My car is dropped and had an intake with some 19's so I don't know if they will be any nala about other mods.
You can try Precision Z Service in Canoga Park. They did my plenum spacer, air intake, mounted my Volks and I got a 4 wheel alignment. Also, they have a Dyno but I haven't done that yet. They said they're going to do a Dyno day sometime in the next couple months, so I'm waiting to here when. They're also a Sponsor on this forum, you should talk to Ed, his number is 818-716-6744.