Not sure about the svt, but My SE has crush bends instead of most aftermarket catbacks mandrell bends. So that should net an hp or two over stock, plus a little more as the mods continue.
98 SE
BAT Big Brake Kit "C", Throttle Hang Fix, B&M Shifter, Lightly Cracked Secondaries, BAT Euro Handling Kit, 20% tint, Removed Ding Strips, ES Motor Mount Inserts, Borla CatBack, Apexi SAFC, HighTower Rear Brace, BAT 19mm rear bar, MSDS Headers & Y, AFE 20-35008 filter, ClutchMasters Stage 1, Fidanza FlyWheel, SVT T.B.
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svt uppers and lowers,
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