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An airbox modification performed on a 1996 Saab 900. The goal of this simple upgrade was to enlarge the airbox inlet pipe and reduce the airflow restriction caused by the narrow original pipe.

 

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27.05.2005: Airbox
Locate the airbox, take off the cover and remove the air filter insert. Unbolt the bottom half of the airbox (three 10 mm nuts) and pull it out of the car.

 

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27.05.2005: Pipe removed
The original inlet pipe just snaps into its base. Once you unlock the two latches, the pipe just slides out.

 

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27.05.2005: Soldering iron
Cut the base of the pipe. If you don't have a Dremel, a thin soldering iron does a great job of melting the plastic...

 

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27.05.2005: Hole
...and the base falls out leaving a gaping hole. Use a round file to make the edge smoother.

 

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27.05.2005: Funnel
This $3 funnel from a hardware store will serve as replacement for the stock pipe.

 

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27.05.2005: Funnel cut
The funnel cut to the size. Inner diameter 3", outer 4.5". This is the biggest size you can fit between the fender and the headlight.

 

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27.05.2005: Finished
The same soldering iron can be used to "weld" the funnel to the airbox.

 

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27.05.2005: Inside
A thick bead of glue/sealant completes the job from the inside.

 

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18.10.2005: Airbox inlet
A close-up of the modified inlet pipe with a headlight removed.

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