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The bad news is there is not much available for the late 960/S90's
There is a factory lowering/sport kit you can get Blackmarket for $2,000. For some stupid reason they are not available to U.S. dealers.
There also is a ECM reprogram available from the same company out of Canada.
http://www.eurosporttuning.ca/
They don't list the suspension on the site but if you ask they will get it for you. The ECM runs $490.00 and it is only for the 95-97 960/S90
You may want to ask about a ECM for your 98 they may be able to get one out of Europe for you.
Some of the guys have ripped out the snorkel to the air box and replaced it with clothes dryer ducting for better air flow. You can also find a set of early cams for the 92-94 960's. They made 23 hp more than the later cams at higher rpms. Here is a link showing the different HP/Torque graphs on the two different cam set ups. http://www.volvoclub.org.uk/tech/S90Specifications1997.pdf
As far as the exhaust goes it is pretty well designed from the factory and not much can be done to improve it.
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