Switch AST Throttle Body with Z3 rubber boot

[///Manuel]

Do you guys happen to have the Z3 AST-less rubber boot part number?
Can you think of a 3" rubber pipe can I could use instead?

[braindamage]

Try this page:

http://home.earthlink.net/~r_tech/cars/firstmods.html

[SG_M3]

its really easy to do. The part from the dealer is $15. i did it out of convenice, i don't have to press the button now everytime i start the car.

[///Manuel]

too lazy to go to the $tealer, I went to home depot and got a 3" rubber pipe for under $8.
Cut it out to match the AST TB, plugged it in, works great, looks great!
Ain't nothing better than homemade mods

[Scho]

Is this mod reversible in the case you sell the car???

[Matthew C Smith]

13 54 1 740 073 looked like a boot for that purpose. I'd check the part before I bought it though. It was for the MZ3 coupe.

[SG_M3]

Originally posted by Scho
Is this mod reversible in the case you sell the car???

It is totally reversable, just put the old boot and asc tb back in.

[Scho]

Is there any HP/TRQ gain from doing this since it is less restrictive?

[///Manuel]

Every mod I do is reversible and easily for that matter.
The hardest one will be to paint my kidneys chrome.

But anyway, I know somebody who dyno'ed his car with and without and got a 5hp gain without.
Inside the AST throttle body you've got a plate and a bar that pivots. The bar is kinda thick and does increase restriction plus it screws around with the air flow.

One of these days (maybe after exhaust mod), I'll dyno my car to see what it puts out.

[Matthew C Smith]

this modification will surely increase power...

the AST throttle body is smaller than the engine's actual throttle body, so you'll be removing a pretty good sized restriction from the intake tract.