Parts ARE Guaranteed

Well, what can you say if the parts are guaranteed? I've got a service and MOT due, and I like the idea that everything is guaranteed. On the other hand, I like the idea of sticking some modded parts in the car. This would include the following:

• Uprated brake pads
• A new stainless steel exhaust
• An uprated, new sports performance air filter

All of these should see minor performance increases on my car, but more importantly they are SAFE. Along with my yearly MOT, the car should be pretty well ready for anything, given that it has tyres that are only a month and a half old.