Swift Helper/Tender Springs R53 Engine Parts Because its a factory part

Because its a factory part it is a direct fit ready to go

Adding caster will also give a more positive on center feel at speed

If you have a later car

Spring rates for the M4

Additionally

Swift Helper/Tender Springs R53 Engine Parts Because its a factory partAssist Springs Get the best of both worlds, Swift assist springs provide a dynamic step linear rate. Like our helper springs, the assist springs are designed to be fully compressed at static height. Every one of our assist springs compress to the exact same height. This allows drivers to change assist springs without resetting the perch on the coilovers so the ride height isn't affected. Heavier rates of assist springs over helper springs are used to