question about the kw and stoptech`

[E85_Z]

i already have a set of Kw v3 and stopteck 4p BBK on my 2005 z4 3.0i.

and i am gonna sell it (or trade in) for a m coupe.

the question is, can i still use the kw and stoptech on the m coupe.

One of my friends, he is a mechanic working in BMW dealership, says i can use them. But, i checked the website of kw, they have differnt parts no. for non-M and M.

Anyone have experience on this? What should i do?

THX

[O-cha]

Your mechanic friend should be shot.

[daveysew]

O-cha is a little over the top but is making the correct general point. Both are different parts (and part numbers) for M and non-M cars and don't transfer between the 2 cars. Even though aesthetically the cars appear the same they are very, very different when you get into the mechanicals.

I am curious what BMW dealer your friend works at? Dealer tech's often have little knowledge of aftermarket parts for BMW's as they are trained only on factory parts and as a matter of course only recommend you use OEM parts from BMW. As such dealers generally aren't a good place to have aftermarket modifications done to your BMW, specialty shops dealing in BMW performance / racing are generally a better way to go.

dave

[E85_Z]

thank you for let me know the truth, bro.

u have a sick IR mcoupe,.

[AWM3]

The brakes certainly could not be used. But the springs and shocks might work, with minor modifications. I haven't taken these apart myself, but I would guess that the main difference would be in the front upper strut mount. I don't see why the bottom of the front mounting would be any different, or anything in the rear. Then it gets to a matter of shock and spring tuning for M vs. non M, which might be a matter of personal taste instead of a fitment issue.

[CalRick]

The brakes might be usable/adaptable, but wouldn't be an upgrade from the OEM brakes. Stoptech specs 355 or 380 mm brakes for the M but 328 or 332's for the standard Z's - about what the OEM M is. If you want to upgrade your brakes your best bet is to sell off your Z BBK and buy the correct one for the M.

[E85_Z]

Originally Posted by CalRick

The brakes might be usable/adaptable, but wouldn't be an upgrade from the OEM brakes. Stoptech specs 355 or 380 mm brakes for the M but 328 or 332's for the standard Z's - about what the OEM M is. If you want to upgrade your brakes your best bet is to sell off your Z BBK and buy the correct one for the M.

Originally Posted by car62

The brakes certainly could not be used. But the springs and shocks might work, with minor modifications. I haven't taken these apart myself, but I would guess that the main difference would be in the front upper strut mount. I don't see why the bottom of the front mounting would be any different, or anything in the rear. Then it gets to a matter of shock and spring tuning for M vs. non M, which might be a matter of personal taste instead of a fitment issue.

That is true, even i can use it, it will not be an upgrade.

For the KW, i will ask more mechanican.

thank you for all of your help!!!!

[GP20]

Don't bother asking your mechanic about the suspensions. O-cha is right. They won't fit. The non-M uses E46 style front struts. The M uses E36 style front struts. Completely different animals.

[E85_Z]

Originally Posted by GP20

Don't bother asking your mechanic about the suspensions. O-cha is right. They won't fit. The non-M uses E46 style front struts. The M uses E36 style front struts. Completely different animals.

hey, buddy. u finally come.

i was looking for u all the time. i saw ur signature be4, i know u have had 4 Z4s, i am sure i have the experience for it.

thank you so much, bro.

[AWM3]

Originally Posted by GP20

Don't bother asking your mechanic about the suspensions. O-cha is right. They won't fit. The non-M uses E46 style front struts. The M uses E36 style front struts. Completely different animals.

Thanks for clarifying that. I have never seen the front suspension on a regular Z4. Sorry for the bad information.