I have a 2006 4.6L V8 GT MustangI have been offered aMax Micro Tuner for a reallygood price
is this a good purchase and if so does this increase horsepower.any advice wood be greatly appreceiated.

 

I've never used that particular brand, but it seems decent (depending on the price.) Do you have enough mods where a aggressive tune would make a huge difference or are you stock? Personally, I wouldn't get a tuner until I had enough mods to make a huge difference. But you can mess with things like shift points, rev limiters, shift firmness, etc.