I have a Cobra IRS in my Fox Mustang; which package do I need?
We do not have packages listed for this, but we will create a custom package just for you; contact us. For the rear it will have the parts for the Cobra IRS, while the front will have parts for your model year Mustang.
Do front coil-overs cause noise?
Not when properly designed and installed. But just as happens with many performance modifications, they will more readily transmit noise from other sources into the vehicle cabin. More noise transmission happens because the stock rubber upper strut mount is replaced by the spherical bearing of the caster camber plate. Generally, all that is heard is a little more road noise from the tires. However, if something is amiss, in the brakes or suspension, there may be more significant noise transmitted.
Do rear coil-overs cause noise?
Sometimes. The Mustang solid axle rear suspension will allow enough articulation in some driving situations, typically when entering a steep driveway at an angle, that the shock will extend into droop far enough that the spring will lose tension. The loss of spring tension will allow the spring to come loose from the upper perch; the spring may then rub on the threaded sleeve as it slips back into place when the suspension settles down. Installing longer springs will not change this situation.
To avoid any chance of this situation and resulting noise, when using low rate front coil-over springs, stick with stock-location rear springs, as they will always have tension when the suspension droops. Low front coil-over spring rates with a matching stock-location rear spring provides good ride quality and balanced handling. Higher front spring rates, typical of high performance street driving or open-tracking, will require a rear coil-over conversion to achieve the proper handling balance.
There is rarely an issue with the front coil-over springs losing tension, as the Mustang front suspension is independent. Similarly, the Cobra IRS rarely exhibits this issue.
Do I need an alignment after changing ride height?
Yes. Any change in ride height will cause the front camber to change. Any camber change will cause the toe setting to change. While a small change in ride height may not cause a significant enough of a change in camber to require resetting the camber, that camber change will cause the toe setting to change. If toe is incorrect by even a very small amount it will cause uneven tire wear.