Join Date: Jan 2005
Location: Delta, BC, Canada
Local Time: 06:15 AM
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15% seems the most reliable and you don't absolutely need to do anything else to balance out the car.
I started with a rear sway bar. Then CAI, then Pulley. MINIs are well balanced from the factory. If you up the performance on any one part, you should consider balancing out the power performance ratios. The pulley gives you the biggest single power gain. That's why I did the CAI first. To allow the engine to breath in better when I did add the pulley. You should consider a freer flowing exhaust, but it's not absolutely necessary. Given the extra power, you should consider better brakes and suspension, if you really are going to use all that power.
Be careful with this. Once you get started, it's hard to stop (modding).