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There are different sizes of bolts for the intake, and each one has a specific use. There are six small bolts (two for the fuel-line mount and four for the EGR tube). The next size up are the seven bolts for the plenum to the runners; after that, there are two bolts for the passenger side in front of the runners and the driver side back of the runners. The two second-longest bolts bolt in from the inside for the runners (front passenger side and rear driver side), while the four longest bolts go in the lower center spot on each side of the runner.