John Here
The JGTC rear diffuser is the best made body part for fit, finish, quality I have ever seen. The Parts from Japan are the best. I ordered a Carbon Fiber unit but they sent Chris from SOS a Carbon Kevlar unit. To save the 4 week wait I took the Kevlar unit and I had it painted to match my silver 2002 NSX. I could not believe how strong this unit is. It fit like a glove. A bit hard to get on, but once you get it together you will understand why. As far as aerodynamics' The car feels a bit more stable at speed but the weather has not let me go better than 100+.
Well worth the $1500. I went with the JGTC light weight center exit exhaust. 16 lbs (30 lbs lighter than stock) and it sounds great.
All in all I would do it again.
John