Power Chips For 7.6 liter & 8.1 liter engines (Pre-Common Rail) These chips are available in 10%, 20%, or 30% power increase from rated HP. These chips plug directly into the wiring harness near the injection pump. Fits the following John Deere Tractors : 8100, 8200, 8300, 8400, 8110, 8210, 8310, 8410, 8570, 9100 Fits the following John Deere Combines: 9500, 9600, 9510, 9610, 9550, 9650, 9750 up to 2001 year NOTE: If tractor or combine above has a 7.6 liter engine, then the injection pump MUST be a Bosch. The chip will not work if the 7.6L engine has a Nippondenso pump. (And we do not offer a chip for a 7.6L with Nippondenso) These chips are $440.00 for any percentage. Chips are not adjustable (no dials or switches). Comes with a 30 day warranty. Returns/Exchanges are subject to 20% restocking fee. Note: plugging two chips in series does not work (For example: Plugging two 20% chips in series does not give you 40%).   For 6.8, 8.1 & 9.0 liter engine up to 2007 (Common Rail) Will not work on 2008 or newer machines. These chips are available in 10%, 20%, or 30% power increase from rated HP. These chips plug into the rear of the "common fuel manifold" at the sensor. Fits the following John Deere Tractors with 8.1 or 9.0 liter w/ common rail fuel system with 3-prong plug-in at fuel manifold sensor: 8020 & 8030 Series; 7010 & 7020 & 7030 Series; 6020 Series Fits the following John Deere Combines with 8.1 or 9.0 liter w/ common rail fuel system with 3-prong plug-in at fuel manifold sensor: 9550, 9650, 9750 year 2002 & newer; 9560, 9660, 9760 (all) Fits the following other applications w/ common rail fuel system: 6103, 8103, 8104, 8144 Terragator; 4990, 4895, 4995 Windrower; 7200 Forage Harvester (Note: "other applications" list is not complete—call to see if we have a chip for your application based on engine size) These chips are $440.00 for any percentage. Chips are not adjustable (no dials or switches). Comes with a 30 day warranty. Returns/Exchanges are subject to 20% restocking fee. Note: plugging two chips in series does not work (For example: Plugging two 20% chips in series does not give you 40%).