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In Reply to: Re: dreaded theraml reactor? posted by Mike W. on October 24, 2001 at 20:48:57:
Next, get a pair of Bav/E9/Euro E12
downpipes for your car to mate the
exhaust manifolds to center resonator.
You can possibly get these used.
18 11 1 246 262 (front)
18 11 1 346 255 (rear)
75-76 Center pipe is single pipe that flows
well and is (was?) cheap. 18 12 1 245 621.
NLA via BMW, try Bosal
75-76 rear muffler: 18 12 1 245 622.
NLA via BMW, try Bosal
System will be a little loud.
I suggest welding a threaded boss into
one of the downpipes to accept an 02 sensor.
(pick a spot where there is room). This
is helpful when recalibration the air meter
and/or when refitting later Lamda L-jet in
your car.
Early L-jet can be set up to run decently,
though it will never run as well as
later system. Valve adjustment is VERY
important.
MAR
That is correct in essence. To eliminate the thermo reactors you would also need to disconnect the air injection and the EGR, neither of which is a big deal but they do feed into the thermo reactors. A cheaper alternative to headers is the basic cast iron exhaust manifolds off a Bavaria or the post reactor cars going as late as the 88 535i. The later ones have slightly bigger passages but not enough to worry about bothering with in my opinion.
Mike W.
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