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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Jb4 questions



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      02-25-2013, 02:03 AM   #1
Twnturbofanatic
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Jb4 questions

Just ordered my jb4, er cp and tial bov from n54 tuning so stoked! Quick question though I already have a dci and BMW performance exhaust. Can I run map 2 with the performance exhaust since it is a cat back system with better flow over stock or do I still need downpipes so I should stick to map 1 for now. Also while data logging map 5, are you supposed to do a few hards pulls so the ecu adjust boosts levels or do you need normal driving with a few spirited runs.
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      02-25-2013, 02:06 AM   #2
Sparky68
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3rd and 4th gears, run up to about 100mph 3 or 4 times, that should allow map5 to autotune.
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