(approx) 4 Hours
Mechanical expertise or professional installation required.
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Hey, guys. Stephanie with AmericanMuscle.com here with the Eibach Sportline Lowering Springs for 2015 and up S550 GT Mustangs. The Eibach Sportline Lowering Springs are going to be a good option for the S550 GT owners out there who are looking for a spring that will give an aggressive drop and more aggressive handling. The spring is perfect for those S550 GT owners out there that are willing to sacrifice some of the nicer amenities of a softer ride quality in order to gain one of the biggest drops for the S550 from a lowering spring. Lowering springs have a big impact on the S550s. They can completely change the looks of the car without having to change a lot, and the Sportlines offer one of the largest drops for these cars.The Sportline springs are going to drop the GT about one and a half inches in the front and 1.3 inches in the rear. And like I said, it doesn't get much lower than this for the S550 from a spring, and this is an aggressive drop. The drop will change slightly depending on if the car is a coupe or convertible due to the weight differences between the models. But depending on your wheel and tire setup this drop is going to eliminate nearly all of the wheel gap that the GT has from the factory, and it's going to leave the car nearly tucking tire but sitting just above depending on what size wheels you have. Now a one-inch drop is pretty standard across the board for the S550 and I would say that one inch lower is pretty significant for these cars, and I mean significant in both looks and performance changes. So that means the one and a half inch drop that the Sportlines offer is the max drop from a spring that you're going to be able to find. This drop will lower the car's center of gravity enough to create more track like handling capabilities. These springs are really going to reduce squat during acceleration and reduce wheel hop as well. You're also looking at much less body roll during cornering and less nose dive during braking. Lowering the center of gravity this much on the S550 means that these springs are really going to change and tighten up the handling of these cars. Now, if you think one and a half inches is too much of a drop or you really wanna hang on to some of those softer ride quality characteristics, Eibach also makes a pro kit lowering spring. They drop the car about one inch all the way around and they will ride differently than the Sportline kit a little bit more comfortably. To really lay this out, I would say that the Sportline springs are more aggressive and better suited for some track use, or for those that are really looking for high performance and forceful looks. They're an all the way around more aggressive spring. The pro kit springs on the other hand are a great option for those that would like to lower the car and reduce wheel gap but that wanna keep a ride quality and street ability in the forefront of their mind as well.This doesn't mean that the Sportline kit won't work on a daily driven car. It'll work just fine. It really all comes down to your personal preference and what you want out of the springs. The Sportline springs, like the pro kit springs, are still a progressive spring. Progressive springs concentrate on providing balance at all times in order to improve handling. I will say though that since the drop here is more aggressive than most other springs, and keeping the spring rate in mind, that these springs are not the most ideal for drag racing. There are some better options available on the site for you guys that wanna hit the drag strip. Those other options will allow for more weight transfer and give you better results on the drag strip.Now, these springs do provide an aggressive drop but they are still going to work with both the factory wheels and the pre-configured wheel and tire kits that are on the site. These springs aren't going to make the car difficult to drive places but you will need to be a little bit more careful. They're going to be stiffer than the factory springs as well, so you will notice some more road noise and bumps. But I won't say that these give a bad ride quality at all. They're just not as soft as factory. I do wanna say that a lot of times when you're shopping for lowering springs, you're also shopping for things like adjustable caster camber plates and a new set of both shocks and struts. In this case, I wouldn't say that caster camber plates are necessarily required, but I will say that the one and a half inch drop is about the limit of where you would need a set of adjustable caster camber plates in order to get the alignment within spec. It's going to be close, so a set of caster camber plates wouldn't be a bad idea at all.At the end of the day, it never hurts to have caster camber plates. So if you've got the extra cash, I'd say go ahead. But in all reality, you will be able to get away without picking up a set. As far as shocks and struts, this goes back to the drop, too. I would say that you can get away with the factory shocks and struts in this case due to the relatively minor drop in the grand scheme of lowering cars, the more forgiving progressive spring rate, and also the low mileage of the components. If your shocks and struts have a ton of miles on them, I would replace them, but in this case since we're talking about relatively new cars here, I don't think it's necessary. When it comes to price, these springs are going to be in the middle of the road as far as options go. They're not the most expensive, but they're not the least expensive either. They cost just under $250, which is the same price as the pro kit springs. If you're just looking to get your car lowered or you're concerned with ride quality, there are some other options on the site that cost a little less and will get you where you wanna be. On the other hand, if you are concerned with keeping a nicer ride quality and getting as low as possible, you're shopping in the right place. So the install here is going to take about four hours and I'm going to call it a two out of three wrenches on the scale. You will need some knowledge to complete this install, so I'd recommend having a knowledgeable helping hand or taking this to a shop for the install, especially since it's always a good idea to get an alignment after the install anyway. This install can be done on jack stands if you don't have access to a lift, but as usual a lift would be your best bet here. Going to need to a few tools, including a spring compressor, so make sure you have that before you start the install.You are going to need to get down to the spring and strut assembly, so everything like the wheels, brakes, ABS lines, will need to be moved out of the way so you can pull the assemblies out of the car. The spring compressor will help you remove the spring from the strut and install the new front springs, which are compressed and installed the same way. The strut assemblies go back the same way they came out and the install is the same for both sides.The rear is where things are a little bit different but nothing crazy here. Essentially the IRS subframe will be dropped along with the rear shock mount so you can slide the rear springs out. Just like the front, the rear springs install the same way they're uninstalled, and no surprises here. The new bump stops slide onto the shock, followed by the factory dust boot. The new springs can be installed and the IRS subframe can be bolted back up, and that's about all it's going to take. Like I mentioned earlier, a fresh alignment after the install isn't a bad idea. Wrapping things up here, the Eibach Sportline Lowering Springs offer a spring with an aggressive drop and improvements in handling to make for a car that feels track ready. They will drop the car about one and a half inches all the way around and will leave the car sitting just above the wheels and tires. The springs are not difficult to install, they're in the middle of the pack as far as pricing goes, and you can check them out more online right here at AmericanMuscle.com.
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Fitment: 2015 2016 2017 2018 2019 2020 2021 Details
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(approx) 4 Hours
Mechanical expertise or professional installation required.
What's in the Box
|Spring Rate:||Front: 217-331 lb/in. |
Rear: 879-994 lb/in.
|Progressive or Standard:||Progressive||Estimated Drop:|
1.5"F / 1.3" R
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