Looking for more top end
performance from your S52 or M52?
Our M50 plenum adaptor kit is the
easiest and least expensive way to install a higher volume M50
intake manifold on your S52/M52 engine. These OBD2 engines came
with a narrow, low volume/high velocity plenums designed to
increase low end torque while sacrificing high end horsepower
(essentially a street tuned plenum). By incorporating the larger,
higher volume M50 manifold you can expect an increase in upper rpm
performance while only compromising low end power slightly. The kit
includes all necessary hardware and instructions for a complete
installation. This is a thorough kit, but this is an involved
project and mechanical experience will be needed and some tweaking
of parts for your specific install may be required.
Enlarge picture for detailed image
of adapter kit installed on plenum*.
*Kit does not include plenum, oil
separator, or idle valve
**Fuel rail adaptor plates can be
used with 92-95 fuel rail cover (not included), or you can modify
your existing fuel rail cover to allow fitment of larger plenum
Good, but Room for Improvement
From Brian Cook of Round Rock, Texas on 12/23/2012.
While the price and the quality of the components in this kit are good, the fit and instructions have room for improvement. The qualifier of "mechanical experience will be needed" is very accurate as it took quite a bit of test fitting to get the oil separator, ICV, and other pieces to fit securely. It would be helpful if, in the included instructions, all of the parts, valves, hoses, and harnesses that will be used/removed/relocated in this conversion were photographed and shown in some vacuum diagrams. Also, include a hose to go from the ICV to the intake boot since the stock one interferes with the throttle cable. I wonder if one of the machined aluminum adapters would be easier to fit. Regardless, I got it together, no CEL, and the results are noticeable.
Kit not needed on OBD1 Chassis
From Zach AbuOmar of Kalamazoo, Michigan on 12/3/2012.
This kit is great and extremely complete but there is one thing to note and it was a mistake that I made.I swapped an S52 into an OBD1 chassis and thought I would need this kit to make the M50 manifold work, however, it is not needed since you are able to reuse all the bits from the OBD1 chassis. Not a big deal but worth mentioning. Other than that, the parts are very well made and includes everything you would need to do the swap into an OBD2 car.
A needed kit for a plenum swap
From Bryce of Indianapolis, Indiana on 9/10/2012.
Swapped S52 manifold to an M50 manifold this past weekend. This kit is essential for a smooth transition. I also recommend getting a temperature sensor for the M50 manifold unless yours came with one from another car.
From Robert Cook of Scott Depot, West Virginia on 7/8/2011.
Installed on a 96 M3. I needed top end help at the track and everyone said this would help. Not sure it help alot there but was impressed with mid range help it gave (not dyno tested), even the low end improved. Good power helper for the money. A little pricy for what you get but not bad. Fitment not the greatest but its all under the intake and out of site. Fairly easy install.
Great but not perfect...
From KMeisch of Union, New Jersey on 8/12/2010.
I had an m50 manifold sitting around for over a year that I finally decided I wanted to install on my 99 M Coupe as a power modification for the s52. I bought this kit over the eurosport kit because I could not get a hold of them. However, as this kit is cheaper, it also is not as perfect as the eurosport adapter kit is. Whether it is the threading of the temp sensor using a die to make it snugly fit into the m50, the fitment not being perfect and actually not fitting the coupe's engine bay exactly for instance the cyclone separator not sitting perfectly under the manifold like a eurosport kit's does, or the fact that the hose from the icv actually touched the throttle cable from my cruise control unit and actually cause the throttle to be partially stuck open, resulting in me having to disconnect my cruise control for the time being, I wasn't exactly 100% satisfied. However, for the power portion of this mod, I was pleasantly surprised. I went from 220whp to 233whp and my tq didn't change at 217. This was also on a mustang dyno with my only other modification being magnaflow cat-back exhaust which was on the car originally. Overall, product does what it is supposed to do, just not perfectly. Fitment could be improved especially in regards to where the revised placement of some components compromises the cruise control throttle cable, and that the cdv is positioned oddly and kinda just sits there. I might buy one for an M3, but the design is not necessarily perfect for the mz3 body.
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