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It depends on what all you have done to your car, and how long you want it to last. Is it bone stock? Do you have an ECU, Downpipe, Cat-back?
If its stock, I'd be conservative and keep it around 12-13.
If you have some mods, you can boost more safely, maybe up to 15-16.
Take it slow when setting it up, get a boost gauge so you can read it in PSI rather than the stock gauge.
Go over to Volvospeed.com and search on MBC's, there are a few discussions over there that may be enlightening.
-Ananda
98 S70 T5 SEM - IPD/TME ECU, IPD/TME Cat back, K&N, IPD Springs, SAM Strut Bar, 17" Comets.......
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