After driving my '93 with 8v92 for 4 years and putting about 500 miles so far on the '98 with s60 let me tell you there is a HUGE difference between the two. With the s60 and jake on high I barely use my brakes to come to a stop from 60. On low setting it is still better than the 8v was. Rpm's don't seem to matter. When I switch on the jake it is set so that the transmission starts downshifting (when rpms permit) to 2nd. Love it!
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