ok im looking at a 2.5L cougar engine. has low low miles on it. and its under $500. i get the full thing intake, exost manif, ect. its the 170 vir of a 2001-2002. will it fit right or will i have to do a lot of customizing?

Assuming you already have a V6 contour and you have the returnless fuel system(late 99-00), you shouldn't have any problems.

what jason said. If you have a return style fuel system, then thats going to cause a lot of complications.