The Brenspeed Calibrated ROUSH M-90 Upgrade Package can upgrade your
stock 435 HP ROUSH M-90 Supercharger to 490 FWHP. Using a 2.57
Supercharger Pulley, Cold Air Intake, and Brenspeed Custom Claibration
you can see an extra 40+ HP to the rear wheels. Plus you can keep
your stock Roush belt because of the supplied larger idler pulley.
Please select your pulley type from the drop down menu
above. If you dont know what type you have thats
OK. Brenspeed will contact you after your order is place for your
tuning information and we will help determine what style you have at
- Brenspeed Highly Recomends that you upgrade your spark plugs to a One
Step Colder Plug because of the increased boost. Please choose
your Spark Plug Style from the drop down menu above.
- You must use a Fuel System Upgrade with when installing this
Brenspeed Package if your Mustang has other modifications such as
headers, cams, etc because of the extra demand placed on the
stock fuel pump.