I agree with Nima here.
The 3L conversion can be made as simple or as complex as your budget allows.
From an almost straight drop in (full oval port) to highly modded (varing degrees of hybrid)
The most difficult is the fuel rail. If you go full oval port you need to modify your injector harness and fabricate the rail with parts from both the 3L rail and 2.5.
Your next challange is tuning. Many have had good luck with mail order chips from ADC. I am one of those who have not. So keep this in mind as well. My recomendation would be to find a good tuner with at least mustang experience and is familier with ford ecu programming. Otherwise, egr mod simple, cutting off of ears n bushings also simple, custom intake. Everything else is a straight swap.
Too bad to hear you're not going through with it. When I first finished, I thought it was less than what i was expecting, but it is deceiving. The car is QUICK with a 3L. I love it! It's even more fun if ya got a buddy who just spent close to 30K on a Cobalt SS, or other similier car and you're door to door with him all the way up to.. um... as far as the local laws will allow you to go.
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(with a tune i'm positive i'll smoke him)
The 3L conversion is THE BEST bang for the buck mod available for the contour, period.
