Intake boots

[Varinn]

I have an obvious intake leak, and am going to go ahead and have the car smoke tested this week but for the sake of my own knowledge after finding some age cracks in the rubber intake boot I have a question. My car is a 1989 325i, was an automatic but I converted to manual.

The car currently has this intake boot.


Can I order and swap to this one? It is listed as the correct one for a manual trans 12/89 325i. Obviously I would need to modify my brake booster vacuum line setup as the check valve in that one is vastly more complex. I'd like to replace all of my vacuum line (have the material) and the check valve while I'm at it. The check valve I have now is an $80 part though, where the simple manual trans one is $4.


I'd like to set up my engine bay to look like this one for the sake of simplicity

[SpecM]

Yes, I did the same thing. Ditched the silly double lines, ran a single line from the booster to TB using an early e36 check valve

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[Varinn]

It looks like the double hose setup actually has two ports on the throttle body, what did you use to plug the second port?

[Herr Faust Schinken]

my car has the same setup as your car and I've been wondering if i can clean it up without losing any performance or safety if you decide to do it, please do a diy

[Varinn]

I think it's an emissions piece, I doubt it will gain any real performance but I'm looking at it in the sense that it's less things that can leak

[Herr Faust Schinken]

I was thinking more of a performance loss because of possible vacuum loss to the brake booster

[jlevie]

Unless you want to replace all of the intake boot and booster vacuum lines, replace the intake boot with one like you have now. There is no performance advantage either way.

[Varinn]

I'm intending to replace it all, I have a little over a meter of the oem booster vac hose, along with all new clamps. I'm thinking of doing the conversion for 2 reasons:
First is that the new check valve would be $4 instead of $90-$100
Second is it would eliminate more potential leak spots in the future by reducing the connection points from like 8 to 3