So I recently put on a nismo v3 front bumper on (craigslist ftw $100 painted) and I am looking to balance out the aero of my car. Do you guys think the off the shelf Top Secret Diffuser (or shine replica) would provide any extra rear stability at track speeds? I don't want to run a big wing on a street car but I do compete in track days, autox, twisties etc so I'm looking to add some downforce to the rear of the car at track speeds. The only spoiler I really like ascetically is the nismo v1 which probably won't do much. Any input would be appreciated.

 

The V1 is noticeable at high speed, just slightly. No idea on the diffuser, it will probably do something, just not worth the cost.