They aren't bad. I bought one on my 91 SE-R about one year ago, I sold the muffler and just used the 2 1/4" piping with a Remus muffler. It performed well.
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Jordan White (Stormy)
'98 Sentra SE(R)
Hotshot G3 Header, Hotshot CAI, JWT s4 Cams, KYB AGXs, Eibach Sportlines, Courtesy F&R STB's, ES Mounts, MOMO Shifter, Nis-Knacks chrome projector headlights and clear corners, 205/50/15 Pirelli P700Z's on SE-R wheels, 205/40/17 Kuhmos on 17" Borbet Type S's for the summer
15.454 @ 88mph at Englishtown, NJ - with the $hitty stock cams, 14's this season