Random Technology Cat
Pictures and Comments from Shell Black
The second item in upgrading my exhaust was a new
catalytic converter. $205 got me a replacement cat, made to order to the specs of my '91
SE-R. The stock cat, though rusted and dark, seemed to have decent flow. Many have
mentioned that the cat's gut will melt into a "blob" especially under the heat
of turbos. I was surprised to find mine was holding out.
The price at the time I purchased the cat [June 1997]
was $205 from Random Technology
Comments by Merlin Johnson (from General Info on SR20DE exhaust systems)
The OE cat is of good design and is huge for a 4 cylinder. The inlet
and outlet diameter is 2.5", with the inside growing to 3". Aftermarket cats
might get to about 3", but you would have to have a 3" exhaust to make it work,
which would lead to a very loud SR20DE, and I don't think you will gain that much. Either
leave the stock one alone, or take it out for use on the track.
... [after] prolonged runs the OE cat seems fine even with various mods like cams and
headers.
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