- Pigtail springs cannot be properly cut without some fixture (our cars use pigtail springs)
- Tangential ends can be cut (the lower perch on our cars is like this, but you can't cut from there as the diameter is smaller)
- Pigtail springs will stand upright, tangential springs will fall over...
Well, i should really say the ones left making them as many of the knock offs got sued IIRC... (though I'm surprised Ford didn't get sued for using the torq-thrust design)
Honestly, unless you have a donor car with all the part on it you'd need (and lots of time to swap parts over), you're better off buying a car with it...
Truthfully that's the ideal way to go about selecting an engine management system. If a cheaper system has the features you need that a more expensive one doesn't, it's an obvious choice.
To clarify why modifying the AFM is a bad idea (and messing with the screw is a bad idea), they're set...
Cutting a spring if done properly is FINE. It makes the spring stiffer as well leading to a terrible ride. Most aren't cut properly and 99% of people do NOT have the knowledge, skill, or tools to do it properly.
Also, progressives are worthless as there is a progressive geometery in our...
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