Cold Air Filter
Or it also depends on the dealer, and Ford Tech. Some it will not bother, while others will void your warranty. Just talk to your local dealer. Cost nothing to find out.
When you install Ford Racing parts the engine warranty then gets handled with Ford Racing instead of FOC. From what I hear they can be a real pain to deal with too. Its probably still best to go that route or someone like Roush as they also carry a warranty.
Ive never ordered from them but heres a link to the parts, The ford tune is going to be more conservative than others I'm sure but Im pretty sure your dealer can get therse parts.
http://www.fordracingparts.com/musta...mancepacks.asp
http://www.fordracingparts.com/musta...mancepacks.asp





