Steeda Sport Springs: 555-8216 vs. 555-8215

[J.Kidd]

I plan on getting some Steeda Sport Lowering Springs for my 2011 Mustang GT.

However, I have noticed two different part numbers for them: 555-8216 and 555-8215. I was wondering what the difference was.

Also, are either progressive rate springs or are they linear?

Thanks.

 

[Steedagus]

They are the same application, years ago we started using different suppliers to keep up with demands and the 2 part numbers just let us track the supplier chain.

Their total range is progressive but their working range is linear, meaning they will behave more like a linear rate spring in the range of compression they see when installed in the vehicle.

 

[J.Kidd]

Excellent! That clarifies so many things for me and based on the pictures of the springs I have seen, your description of their linear and progressive characteristics makes a lot of sense. Thanks for your help.

Springs are first and then I'll end up going with a Steeda CAI with tuner combination...just gotta save up for that.

Thanks again.

I also have a '92 Mustang LX 5.0L Convertible. It was sent down to you guys back in '92 when you installed a GT-40 top end kit (GT-40 tubular intake and iron GT-40 heads, both with a Steeda port and polish job, 1.7 roller rockers and some fancy Steeda plug wires). So, eventually, both my Mustangs will have Steeda enhancements.