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Message: <blockquote data-quote="Mustang5L5" data-source="post: 1566398" data-attributes="member: 30520">Feal's spring rates are just measured differently.  When they say 8K then are referring to 8 kg/mm of linear rate.     A lot of other vendors use lb/in.So 8 kg/mm converts to 450 lb/in5 kg/mm is 280 lb/inEvery manufacturer has different recommended rates as they just all have different ways of doing things.  Typically lower rates are more for drag and street driving and then you get higher rates for competition.  With stiffer springs, you need higher quality dampers or you will get bounce.    If you ever observe a lowered car bouncing as they hit a bump on the road, they don't have enough damper. Maxmotorsports has a good chart as a general rule of thumb.[ATTACH=full]41891[/ATTACH]That isn't to say it's the only way to think, but I know them best so that's why i'm using their reference material as an example.  As you can see the feal front rates would put you near the stiff end of their chart with a rate of 450 lb/ft.   Feal certainly doesn't make junk at all, but I do agree that their philosophy is a little bit different than some of the other Mustang suspension companies like MM, Steeda, KennyBrown, QA1, etc. I run 250lb/ft front springs on Bilstiens with conventional rear springs (would have to look up the rates).   I make about 325HP, and it's a good compromise with good street manners and performance driving.  If i was more serious about road racing, i'd probably be in the 325-375 lb/ft range and might consider a rear MM coil-over setup and 125# in the rear.   I considered this but most likely am going to leave things like they are.</blockquote>