Not aware of any true removable hard top.......only tonneau covers for the convertible when it's down.
Saleen ownership is great......there are a few with problems here and there, as with any car. However, don't make yourself "car-poor" if this isn't the best time to take over a larger Saleen payment than what you can get a GT for. Use your best judgement.
What's the onlybad thing about them.......they attract a WHOLE BUNCH of attention

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2002 Saleen S281 Extreme #46
Chicane Intercooler & pulley; SCT Chip & Tune; 3.73's; 90mm SCT MAF; 70mm ACCUFAB TB; KB Boost-A-Pump; Spec Stage 3 clutch, High-flow cats; built & tuned by Modular Powerhouse
1997 SVT Cobra #5726 (SOLD)