The Audi TT comes with a stock dual exhaust that is restricted because of the design and material it is made out of. There are aftermarket dual exhaust systems you can install onto your Audi TT yourself using a few basic auto tools.
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Things you need
- Auto jack and stands
- Big flathead screwdriver
- Socket wrench (3/8 inch or 1/2 inch)
- 17 millimetre socket
- 13 millimetre socket
- Extension bar
- 13 millimetre wrench
Spray the bolts that hold the clamps together on the exhaust with WD-40 to loosen them so they are easily removed later.
Park your car on rear stands and put it in "Park." Let your engine and exhaust cool completely. This might take as long as 20 minutes. Pop the bonnet and disconnect the negative cable from the battery terminal.
Loosen the two bolts on the clamp that holds the exhaust system, using a socket wrench with a 17 millimetre socket attachment. Open the clamps so they are loosened.
Use a big flathead screwdriver to pry the grommet off of the centre hanger of the exhaust. Afterwards, attach a 13 millimetre socket to the socket wrench and unbolt the two brackets that hold the muffler in place. When the brackets have been unbolted, the weight of the exhaust system will be connected to one hanger still.
Rotate the muffler slightly back and forth to verify that the compression coupler is loose. You might need to loosen the clamps more if the pipe is not moving. If the pipe is still stuck, you can tap it with a hammer on the clamp area to move it loose.
Use a big flathead screwdriver to remove the last hangar that is holding the exhaust system. Prepare to hold the exhaust as you guide it down out of the car. Make sure the exhaust system does not rest on the catalytic converter, or it can become damaged.
Bend the brackets of the exhaust system if needed to help support the exhaust in the cutouts of the bumper.
Take the stock brackets off the stock exhaust. Put the dual exhaust system into place where the old exhaust was, then reattach the compression coupler. Re-attach the rear hanger to hold the muffler into place.
Re-attach the brackets, then tighten the bolts to secure the dual exhaust into place.
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