Just wondering if there are any stock cars that have a t4 turbo in them?

 

Disel trucks...

 

older supras, older mustangs (5.o), and on v8 domestic cars...

 

supras never had t4's

and mustangs and no other domestic cars had t4's from the factory.

 

The T4 was used on large diesel trucks only, and is not very good for automotive use as it is. Crossing the T4 with the T3 makes a great fast spooling turbo that flows lots of air, but a T4 buy itself would have tremendous lag on anything under about 400 CID.