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.
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.
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.
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...
27.05.2005
Hole

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

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

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

A thick bead of glue/sealant completes the job from the inside.
18.10.2005
Airbox inlet

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

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