Sure you can get more power, but not from a chip. The Cummins 24V doesent use a replacable chip. The post telling about the chip was referring to Mark Chapple of www.tstproducts.com he was reflashing the cummins computer using Cummins propritary software. But he has come back with a box called the powermax with it by itsself you get 275hp and 660ft lb. You can get much more by changing out injectors too. Mark has great credentials too, he is a retired Cummins employee and is listed as the design inventor for the Holset turbo currently used on all Cummins engines. To put to rest the idea that the engine cant handle that much power the ISB Cummins (24V) has an onroad rating of 275/660. With marine ratings of 350 hp and Cummins is testing a 400 hp version of the same engine. Thats kinda pathetic seeing that the powerstrokes highest rating is just 250/650.
I also forgot to say that another great site is www.turbodieselregister.com
its the official page of the turbo diesel register which is dedicated solely to the Dodge with a Cummins. Everyone who owns a Dodge Cummins should be a member.
This site has good credentials too. Sam Memmolo (from Shadetree Mechanic) is one of the supporters and a high ranking member of the TDR staff.
I saw an ad in a magazine today for Gale Banks Engineering. They claim that their "Banks PowerPack" can add up to 127hp and 311 lb-ft of torque to the cummins engine. The phone number is 1-800-438-7693.