In America they love acronymous. They use them for everything, so let’s try:
IMS: “The Porsche IMS (stands for intermediate shaft) is a geared shaft that runs through the front and rear of the engine. It indirectly drives the camshafts on either side of the engine by way of the mechanical rotation of the engine’s crankshaft.”
In the 996 and Boxster and some early 997 this little part tends to fail. It happens to about 8% of cars and more likely than not to cars not regularly maintained or driven often.
When it fails, without warnings, the whole engine block gets totaled.
LN engineering offers two solutions to the problem: one for about 900$, which is good for 50000 miles, one for about 1900$ which is good for life.
The upgrade is highly recommended as with a few thousand dollars you get years of peace of mind.
RMS: “stands for rear main seal, the gasket that seals the connection between the engine and the transaxle”.
This also tend to get old and fail which leads to oil leaks around the crankshaft.
This is how my seal looked, pretty much gone:
BS: means Bull Shit. Like the quotes I got from 2 independent Porsche garages to do the IMS/RMS job on my car. Without going into details, let’s say that both quoted me for IMS and RMS only as much as I finally spent to also replace the clutch, the brakes rotors, pads etc and a few more little works.
One on these shops even quoted me the LN engineering IMS part publicly sold for 899$ for 1400$. BS!
WAI: While At It. When replacing IMS and RMS the clutch and flywheel have to come off. So, “while at it” it makes total sense to service and replace the clutch. Which is what I had done on my 996.
EPE: is European Performance Engineering of Natick (MA). http://epe.com
They are the NO BS shop that quoted me the work at the right price, executed all in less than a week, documented the work with pictures and were informative, transparent and pleasant to work week. Looks like I found the right mechanic for my Porsche and learn an important lesson about reading, asking, shopping around before spending money on a car.