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Frequently Asked Questions

Welcome to the BMW E36 M50 manifold conversion FAQs page.

There are 18 entries in the FAQ.
Pages: 1

Questions:

What models can this be installed on?

Why do you need a custom made throttle body seal?

Will a large amount of upper end horsepower be gained? 

Will a small amount of low end torque be lost? 

Is this modification emissions legal?

Can you use heater hose to make this adapter?

Why are there so many clamps on the hose adapter?

Does this kit come with install instructions? 

What does the modified M50 fuel rail cover look like?

Will the OE S/M52 fuel rail cover fit?

Will an unmodified M50 fuel rail cover work?

Can you install this kit on a car with traction control? 

Can you install this kit with a big bore throttle body? 

Can you install this kit on car with OE software?

Do I need to change software for this modification?

Can you source your own manifold for this kit?

Can you install this kit with a stock airbox? 

Can you install this kit on a car with forced induction?


Questions and Answers
What models can this be installed on?

BMW 328 and M3 (1996-1999) and 2.8l and 3.2l Z3s with the S/M52 motor (1997 - 2000)

It's also possible it will work on the M52 powered 323i and Z2.3, but I have not done this install so I cannot confirm this.

Why do you need a custom made throttle body seal?
Because when you mate the M50 manifold with the S/M52 throttle body you have an extra seal gland to fill.
Will a large amount of upper end horsepower be gained? 
Yes. 15-30 RWHP.
Will a small amount of low end torque be lost? 
Yes, but you probably won’t even notice it.
Is this modification emissions legal?
No.  But it will pass the dyno emissions test assuming the rest of the emissions system is in good working order.
Can you use heater hose to make this adapter?
NO, if you don’t you use fuel or oil rated hose the adapter will break down over time, collapse under vacuum, and cease to function.
Why are there so many clamps on the hose adapter?
The hose adapter needs to make very sharp turns around and underneath the intake manifold and accessories.  Nearly all hose material of this diameter will kink and deform if bent too tightly, so elbow fittings are used to make the turns.  After trying many different types of hose materials, shapes, configurations, etc.  It was concluded that this is the best overall design.
Does this kit come with install instructions? 
Yes. 28 pages including color photos.
What does the modified M50 fuel rail cover look like?

Like this:

img_1624.jpg

Will the OE S/M52 fuel rail cover fit?

Yes, but this is what it will look like.

Will an unmodified M50 fuel rail cover work?

Yes, but this is what it will look like:

Can you install this kit on a car with traction control? 
Yes.
Can you install this kit with a big bore throttle body? 
Yes.
Can you install this kit on car with OE software?
Yes.
Do I need to change software for this modification?
No. Any program, even stock, will work just fine.
Can you source your own manifold for this kit?
Yes, and the instructions include the manifold mods required.
Can you install this kit with a stock airbox? 
Yes.
Can you install this kit on a car with forced induction?
Yes, but it may need slight modification to fit perfectly depending on your setup.

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