Information on the exhaust can be found here:
A&J Racing :: Exhaust :: Exhaust Systems :: T1R Sparrow Exhaust - Nissan 370Z 09-11 (Z34)
The design of exhaust system is almost identical to sunline racing's.
I was very satisfied with the sound which resulted in few local members purchasing them soon after hearing my exhaust sound.
Local shop who installed the exhaust was impressed with the built quality as well.