Yes i have tried it,no noticable to me.I found some pics of the konceptus silencer.Gives you a rough idea what i mean by it blending in.It worked pretty well,but my 97 had a v-mach kit fitted,dont know how effective it would be on a 97 out the box.
http://i223.photobucket.com/albums/dd76/WILDAXBOXER/P1010488_zps2dbd663b.jpg
http://i223.photobucket.com/albums/dd76/WILDAXBOXER/P1010489_zps57217d8e.jpg
http://i223.photobucket.com/albums/dd76/WILDAXBOXER/P1010487_zpsecda08ab.jpg
http://i223.photobucket.com/albums/dd76/WILDAXBOXER/P1010486_zpsa8495706.jpg[/quote mines been sfs stage 2 tuned