If you like your car to rotate some, you are going to be disappointed running just about any rear wing at 0 degrees with no front splitter. Increase the AOA and it will only get worse.
Your rear will feel planted but I guarantee you the understeer will make you soil yourself if you're not ready at a fast track like Big Willow, Fontana or even through a fast sweeper like Riverside at Buttonwillow...or for "the canyons are life" crowd you could find the edge of a cliff when you least expect it on a fast sweeper somewhere on ACH or GMR.
Pretty much every Z driver I've competed with that's run no splitter has regretted it. I also did it for a while during 2020 and the car feels much better with it on. But hey, do what you want it's your car and if you like a car that plows harder than the milkman on your mom, go for it.
As far as aero goes, I'd stay away from anything made by Street Faction, Battle Aero...etc. I don't know anything about the rumor that INGS is really just made by Voltex, I can tell you that Voltex doesnt necessarily put their stuff through much wind tunnel testing. However I can tell you that companies like INGS and C-West actually run their products on Z's in the Super Taikyu series.
So what's trackable? Depends on who you ask, some janky people run some janky @$$ things out there and it more or less works, most of the time...or some times your wing comes flying off down the front straight at Fontana (happened to a friend).
Also if you're looking for a splitter that fits the Nismo V1 bumper, I got that covered.
