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Message: [QUOTE="KCTurbos, post: 1006867, member: 13852"] Exhaust leaks are a big problem. Bigger turbos will usually make leaks worse. Check the ypipe bellows and the ypipe to turbo connection. Those are very common. An easy way to check it would be to have someone stick the truck in drive, hold the brake, and give it some gas. Push the pedal as hard as you can without causing the truck to move. Look for any smoke coming out from behind the turbo. If you see any smoke then you need to find and fix the leak. Boost leaks are also a big problem. The most common areas are the boots on the charge pipe, plastic ends on the intercooler, and the plastic hot side charge pipe on the drivers side. If you have a plastic charge pipe on your drivers side then replace it ASAP. They will not hold up under high boost. You can check for boost leaks in the same way as an exhaust leak. MAKE SURE THE TRUCK IS COLD so you don't burn yourself. Have someone stick the truck in drive, hold the brake, and give it some gas. Push the pedal as hard as you can without causing the truck to move. Use your hand to follow the lines from the turbo to the intercooler and then from the intercooler to the intake manifold. Feel for any leaks. Some people use soapy water too. There is also a special tool that you can buy that makes this process much easier, it is actually used to pressurize the system. Pull and check all of the following sensors. Use your programmer to make sure they are reading right. MAP sensor located on passenger side by the air box. Make sure the tube going from the sensor to the motor is not cracked. Make sure the tube and sensor are clean and not plugged. MAF sensor is located between the air filter and turbo. make sure it is clean and plugged in. EBP sensor is located off the exhaust manifold on the drivers side. There is a tube going from the exhaust manifold to the sensor. It is very common to clog and have issues. Clean out the tube and make sure the sensor is not clogged. IAT sensor is connected to the top of the intake manifold near the fuel bowl. Pull it out and make sure it is clean. It is very common to get covered in crap. Clean it and make sure it is connected right. Baro sensor is located under the dashboard. Make sure it is plugged in and reading right. VGT solenoid. The vgt wire/pigtail are very common to have cracks, slices, and breaks in it, especially right where it plugs into the solenoid. Double check everything to make sure it is working right. An easy way to check and see if it is working right is while the truck is running. plug and unplug the sensor. You should be able to hear the exhaust sound changing when you do that. These don't relate directly to boost but it is still a good thing to check. They can really hurt performance. ICP sensor IPR FICM (make sure voltage is good) [/QUOTE]