A slight technical correction. The warranty information can be found here:
http://www.mountuneusa.com/mountune-Fiesta-ST-MP215-Performance-Upgrade-p/2364-215-aa.htm
As I read this (disclaimer: I was a lawyer in a former life), the Mountune parts come with their own 3/36 warranty, which starts to run
from the start date of the new vehicle warranty, in other words from when the car was 1st purchased. So after 3 years or 36k miles from when you 1st bought the car, it's done, no matter when you had it installed.
Mountune also states that the warranty works "in conjunction with -- and does not void -- the Manufacturer's New Vehicle Limited Warranty."
OK, great so far. Except that under M/M, aftermarket parts can't "void" a warranty, just problems that can be shown to have been caused by the aftermarket parts in action. Mountune/Ford states further, "Engine, driveline and suspension concerns
not caused by Ford Racing Performance Parts remain eligible for warranty coverage according to the terms of the New Vehicle Limited Warranty." Again, nothing more than M/M already provides.
So on to what they do provide:
Ford Racing and mountune LLC performance parts are aftermarket parts. The use of Ford Racing and mountune performance parts may impact the performance characteristics of other systems of the vehicle. Even when operating properly, Ford Racing and mountune performance parts, such as these, have the potential to adversely impact other systems of the vehicle. If an adverse impact is caused by a warranted Ford Racing or mountune performance pack or component, the period and coverage of this Ford Racing Limited Warranty applies to the repairs.
Bottom line: if you have Mountune mods, 3/36 from initial purchase you're good; after that, you're good luck.
So I think it is a bit misleading for Mountune and Ford to call the MP215 "warranty friendly" any more than a Cobb CAI and AP are warranty friendly. What they really should say is that Mountune parts labeled "warranty friendly" carry their own limited warranty only when installed by a Ford dealer, and that warranty is limited to the sooner of 3 years or 36k miles from when the car first was purchased.
This is not a slam against Mountune (I have a short-shift and FMIC), just an attempt to bring some "actuality" to the phrase "warranty friendly."