Bonjour,

Am going stem to stern on 81 244GL projekt kar, now it's time to deal with the exhaust.

Would like to be able to use brand new free parts for an '83 245DL on the '81. I understand everything behind the CAT is the same on the two, but up front....

What's the diff. in the front most pipe and cat bet. the B21F and B23F? I'd be getting a Bosal 832-927 front pipe, parts locator specs. 831-927 for the '81.
Numbers for the cat are diff. too.

O2 sensor looks to go in same spot, the Starla pipe I put on another '83 looked pretty universal and has a plug in down low where I think later models would have the sensor.

Eyeball verification tells me the pipe's the same. When they bored out the 2.1, did this change the exhaust manifold or anything else I should know about?

Many thanks as always,

Frank in OH

I believe there were three or four different exhaust manifold used 79-84. One difference I'm chagrined to report is the location of the threaded hole used for the O2 sensor in B23F cars is about an inch out of line and threaded slightly larger than the one for the EGR inlet pipe used in earlier cars.

I'd like to know what the difference are between the 84.5- and the -84.4 head pipes beyond the relocation of the oxygen sensor. The Starla I bought for the earlier car has a warped flange. I was going to try my luck with Bosal for that model.
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Art Benstein near Baltimore