The GTP38R will work very well with the tunes you already have. Most tunes are designed to get the most out of the stock turbo which is "slower" than the 38R. The 38R will run great on the tunes you already have.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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