I have a Viggen intercooler, 3" DP and cat, SaabSport cat-back (2.5"), and the GenuineSaab Open Air intake.
The intercooler isn't fully necessary, but I got a killer deal on it. I would do a full exhaust (3" DP and some sort of HiPo catback setup) and a modded airbox at the very least.
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