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Message: <blockquote data-quote="uncle tobby" data-source="post: 138759" data-attributes="member: 3009">there r few types of piggybacks 4 ecu remapping, but d top lines r superchip & unichip when we r talkin about BMWs. my guess is all d statement discussed here r true, & oso unsurely true... these various kinds of chips give good air + fuel for greater fuel combustion, making d vehicle smoother & way-way faster, no cut-offs when u remapped,we all know these facts theoretically. it would b appropriate if (4 u guys yet 2 install) u do minor mods & have d things ready b4 remapping ur ecu's (i.e mufflers & exhaust system, filter, cables, etc.). it is costly 4 tuning up (around $400-500 -an additional 250-300 for dyno test). Here's an example: u remap ur ecu & thus u can feel d difference. few mths later u saw a complete set of exhaust system, ori samor,cheap samor, it fits perfectly samor..hey, bet u wont even look away or thinking twice 2 buy it, i wouldnt!!!there goes $700!then u take a long drive up north or south. as soon as u return engine ada rasa lain, no umphh  due 2 tuning lari sikit.Riiiight, another $700.List goes on...anyways, im still trying 2 find out which is better 4 udms, superchips or unichips. can check out stuttgart 4 superchip. they should know cos they have it there. unichip costs around $1999 to $2200.</blockquote>