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You can run map 2 without Downpipes... Lots of JB4 user do. I run map 3 with a 60 additive no problem. Just log and make sure things are looking good. I didn't like my DD sounding like a V6 accord with AEM exhaust but that's just me.
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ASE master tech (many moons ago)335xi- JB4 G5 iso/e50 custom flash/Custom meth/Borla mids/Custom x-pipe/DCI/ER charge pipe/Dual Ebay BOV's/Alpina B3 flash/Paddle shifter retro fit
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