I took a look at my Detroit Diesel Service Manual and couldn't find anything definitive, but section 12 shows certified turbo engines starting at about 240 hp, so I doubt that you can get much more out of a non-turbo engine than you are getting. You can't just add a turbo to your engine since compression ratios change as does the blower ratio. I would check with a DDC dealer to verify what is possible with your existing engine, but I wouldn't get my hopes up. Then you also need to determine the hp rating of the transmittion, that may be a limitation as well.
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