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My Stillen Sway Bars arrived today. Ordered them the first week of June through Concept Z as they price matched Redline 360 (no shipping cost, veteran discount, etc.). Recall that these are the same diameter as the 370Z Nismo and IPL bars, but adjustable up to 48%(F)/70%(R) higher than those OEM versions. The G37S RWD OEM bars (purple marks) are the same diameter as those found on the 370Z base model.
Stillen said due to high demand, they were out of stock and a new batch needed to be made. The box they shipped them in was huge and very sturdy, however, the bars themselves were only in basic plastic bags (not bubble wrapped and no Styrofoam inserts), so they banged around in the box during transit (so much so that I heard them clanking together when UPS dropped them off). The chips aren't game changers, but still a little disappointing.
In the coming weeks I plan to install them with my new OEM end links and sway bar bushings (the Stillen bars use the OEM version of both). Per the research I've done and discussions with Miza at Stillen in Costa Mesa CA, our platform tends to respond best with the front bar set to the middle setting (34.5% stiffer than the G37S RWD OEM Front Bar) and the rear bar to the highest setting (70% stiffer than the G37S RWD OEM Rear Bar). As such, I will start here and let you guys know the verdict as I have resisted this upgrade forever since I felt my car had almost no body roll and handled well with the factory OEM bars.
It was probably disappointing to see those chips in the powdercoat because of the careless packaging, but you're right that the correct approach is to just move on. There were be more over time during use, so don't sweat it. No one is going to see them unless they get down real low in the rear.
Do they reuse the OEM frame brackets with new bushings to fit, or did they come with new brackets & bushings? I've always liked how the Hotchkis sways come with Zerk fittings on the frame brackets. That said, I've never ever regreased my Eibach frame bushings, so whatever.
About time you did this, socket. Looking forward to your reaction after realizing how much more flat and controlled your car handles.
It was probably disappointing to see those chips in the powdercoat because of the careless packaging, but you're right that the correct approach is to just move on. There were be more over time during use, so don't sweat it. No one is going to see them unless they get down real low in the rear.
Do they reuse the OEM frame brackets with new bushings to fit, or did they come with new brackets & bushings? I've always liked how the Hotchkis sways come with Zerk fittings on the frame brackets. That said, I've never ever regreased my Eibach frame bushings, so whatever.
About time you did this, socket. Looking forward to your reaction after realizing how much more flat and controlled your car handles.
Only bars as they use the OEM frame brackets, bushings and Endlinks. Mine were original, so I purchased new bushings and Endlinks. I have never had to grease the OEM bushings (12 years), so I'm not sure if the Zerk fittings on the Hotchkis are necessary. Their brackets/bushings look really good and their bars are huge, so maybe grease fittings are necessary?
I have no idea if the frame bracket bushings need regreasing, but those Hotchkis brackets have Zerk fittings for a reason. And you're right, the hardware looks really cool.
The bushings in my old Eibach sways were from Energy Suspension. If I recall correctly, they reuse the OEM brackets, but came with bushings to fit the bars. But it's been over a decade, and my memory is mush.
I'm also still using the original OEM end-links, but they only have 55k miles on them, 40k of which with the aftermarket sways. My thinking is to replace them when they break and go clunk. I've floated the notion of upgrading the end-links here a few times, and the advice kept coming back to chill on that.
I have no idea if the frame bracket bushings need regreasing, but those Hotchkis brackets have Zerk fittings for a reason. And you're right, the hardware looks really cool.
The bushings in my old Eibach sways were from Energy Suspension. If I recall correctly, they reuse the OEM brackets, but came with bushings to fit the bars. But it's been over a decade, and my memory is mush.
I'm also still using the original OEM end-links, but they only have 55k miles on them, 40k of which with the aftermarket sways. My thinking is to replace them when they break and go clunk. I've floated the notion of upgrading the end-links here a few times, and the advice kept coming back to chill on that.
I probably could have gotten another 20K out of mine, but since I'm replacing the bars it makes sense to replace since everything needs to come off. I feel like you when someone asks me if I love my exhaust. I struggle to think of a time before I had the exhaust. At some point I should probably sell the factory axleback as it still looks new. I will probably keep the OEM sway bars for nostalgic reasons and they may be worth something one day coming off of a RWD sport model. I need an extra garage.
The RWD G37 has a different rear sway than the AWD... and that's irrespective of the Sport Package. I *think* the fronts are the same, but don't quote me on that.
Point being, an AWD owner might want to buy your rear RWD sway (or both).
The RWD G37 has a different rear sway than the AWD... and that's irrespective of the Sport Package. I *think* the fronts are the same, but don't quote me on that.
Point being, an AWD owner might want to buy your rear RWD sway (or both).
AWD has a beast in the front, likely to induce more understeer for safer driving in inclement climates.
Larger rear bar will reduce understeer to some degree, but that front bar is still large.
G37 Sedan Sport Model RWD (same as the base 370Z) Front: 26.5 Rear: 24.2
AWD sedan Front G37 AWD sway bar diameter: 31.7 (Hotchkis is 35mm) Rear G37 AWD sway bar diameter: 17.5
The Stillen bars are the same size as the Nismo Z, but adjustable and with thinner inner walls, which is why they can reuse the OEM HW.
Good for you with the specs. Your numbers > my "if i recall" comments, LOL.
Tough to commit to memory all of the numbers we see flying around here on the community. This is why I sometimes repost numbers I find in older threads where the user put alot of time into collecting them.
Here's an idea. Find yourself a familiar (and safe) location where you can push the car as-is to its extents, like a lonely on-ramp. Turn off traction control, and take note of your speed and situation when the tires start squealing and you understeer before backing off. Do that a few times to get a sense of what the car can do. Then do it all over again after the sways are installed.
I used to describe it like this... if you can take an on ramp at 30 before it starts pushing wide, with aftermarket sways you can take it at 40. And instead of understeer, your slippage will more likely be oversteer.
I mean, there's some hyperbole there, sure. But there's some truth too. Have fun with it, socket.
Here's an idea. Find yourself a familiar (and safe) location where you can push the car as-is to its extents, like a lonely on-ramp. Turn off traction control, and take note of your speed and situation when the tires start squealing and you understeer before backing off. Do that a few times to get a sense of what the car can do. Then do it all over again after the sways are installed.
I used to describe it like this... if you can take an on ramp at 30 before it starts pushing wide, with aftermarket sways you can take it at 40. And instead of understeer, your slippage will more likely be oversteer.
I mean, there's some hyperbole there, sure. But there's some truth too. Have fun with it, socket.
It definitely turned out to be a wish I’d done it sooner mod. Between the new bars, end links and bushings the suspension feels much more in control pushing the work off onto the tires as the car stays flat and pushes a tiny bit of oversteer when pressed. What’s odd is how much heavier the Stillen bars were compared to the OEM units. Maybe 3x the weight.
Last edited by socketz67; Aug 9, 2025 at 09:51 PM.
It definitely turned out to be a wish I’d done it sooner mod. Between the new bars, end links and bushings the suspension feels much more in control pushing the work off onto the tires as the car stays flat and pushes a tiny bit of oversteer when pressed. What’s odd is how much heavier the Stillen bars were compared to the OEM units. Maybe 3x the weight.
That's fantastic to hear. Been saying forever how sways are the best most simple bang-for-buck mod you can do to these cars.
Now you're probably asking yourself... what else can I do to tweak how this car handles? The answer might very well be nothing, it's awesome just the way it is.
Looking forward to your reaction after realizing how much more flat and controlled your car handles.
