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You should do a search and you will find your answer
Since this is you first post, you get a pass
The only real way to check the IMSB is to drop the transmission and physically check the IMSB
If the engine is making a sound like marbles, run away fast as it has major problems
There really is no audible warning, once you can hear it it is too late
If you find a serialized LN label on the door jamb, the IMSB was replace with a LN Engineering IMSB
If you are super lucky, you might find a Flat 6 Innovations sticker and in that case you have an upgraded engine
You can also look through any service records
early 987s have a non serviceable IMSB, you have to split the case to replace it, but it is a larger stronger one, so the likelihood of a problem is much lower
do some searching and you will find additional information
Good luck in your search
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
Last edited by JayG; 09-04-2015 at 04:01 PM.
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