Does anyone in here have a G35 which had been built after November 2003 and are running any brand of TEST PIPES... If so, has there been any problems with the engine light coming on...?

I was told that if the production was after 11/03... I was only able to run high flow0 cats or the engine light would come on... if the production date is b4 that date then test pipes where okay to use... Is this statement true....

I was hoping it isn't true... because test pipes are way cheaper...

Any feedback ould be greatly appreciated
THANKS IN ADVANCE

Jeremy