ive just tried making a tune for my ultima and it wont install the turbos for some reason i had the same problem with forza 4 whats going off?
Some legacy upgrade issues are carried forward to FM6. So if you experienced an issue back in FM4/FM5, the problem could still persist.
Sell the car and try buying the car again
done that still the same problem on forza 4 it was the charger with the turbos
I had similar issue on Mitsubishi Lancer X, me thinks.
If you installed someone else’s tune, and, had not previously installed/purchased the turbos…then, this will happen to any car, all the time. Buy the car, buy all the turbos for that car, then, it will be OK. Again, this is if you loaded a tune prior to your turbo purchases. This is a known issue for many of the FM’s.
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PRKid is correct and this problem applies to ALL aspiration conversions. When I buy a new car and before I load any unknown setup I buy all the aspiration conversions for every engine combination.
ill try that out later 
What a waste of credits…
Are you really finding lack of credits a problem? Ruining a potentially very expensive car is not a good option either