Under Extended Warranty, but MUST have more power
I am sure the question had been answered before, but I need specific instructions from someone.
I have a 2010 E63 under warranty until 6/2017, so I want to add some decent power without jeopardizing my warranty. Do we have some good solutions? Please don't suggest air filters.

Also, I want to switch to some 20" rims for the car. So, what is the best/largest combination of front/Rear and tires should buy without scratching??
Thank you in advance!!
Good one! I like the one about little red riding hood better.
Turning up the power and warranty coverage is incompatible. You should know better -- trix are for kids!






