You mean the header pipe.Its veryu easy. IF its rusted soak it a few times &Kb Blaster,& hit the nuts w a hammer & it should come loose..where the cat pipe meets the header shouldbe welded securely. I had a bracket from fcp fail after about 6 mos..it cracked the cat/headr connection& o2 sensor flooded engine w extra gas,,,ruined the cat,,finally sstoped the engine completely

For parts, try Voluparts, Atlanta, GA. For a new cat, I put on a Magna Flo which has been fine so far.

Dear wally660,

Hope you're well and stay so. Volvo VADIS - a superseded dealer parts/service database - shows two down-pipes for a '940, non-turbo. For engine without Exhaust Gas Recirculation (EGR), the part is #9135306 or 9139285. For an engine with EGR, the part is #9135305. Volvo no longer supplies these pipes.

I recall a post - possibly by "rstarkie" - that there was no obvious difference between these pipes. But that recollection could be faulty.

I supply the part numbers, in case an after-market pipe-maker can use them to identify one of its products, that will fit and work properly.

As the oxygen sensor on non-turbo 940s fits into the catalytic convertor, perhaps a custom exhaust shop could replicate the worn-out down-pipe. If the factory-original flange - that attaches to the exhaust manifold - is not rusted-out, that section could be salvaged and welded to new pipe.

If the flange, that attaches the down-pipe to the catalytic convertor (cat), can't be salvaged, the down-pipe can be welded to the cat.

At a custom exhaust shop, a craftsman might be able to use stainless pipe, which will last for a couple of decades.

I hope this information is helpful.

Yours faithfully,

Spook

Parts schematics, part numbers, Volvo pricing and part chain availability for your '94 940 NA B230F exhaust system can be found here:
https://www.volvopartswebstore.com/showAssembly.aspx?ukey_assembly=240328&ukey_make=865&ukey_model=20180&modelYear=1994&ukey_category=7072&ukey_driveLine=394

Clicking on a part number allows you to check the fitment across models and years.
Parts not listed are unfortunately no longer available from Volvo so you will have to check aftermarket and even used sources. Someone like Spook with the old Vadis CDROM will hopefully be able to provide missing part numbers for you.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now

Hi Wally,

I can't help you with your parts question.
I do suggest that you start soaking the exhaust mainifold bolts with
Mystery oil way ahead of dissembly time.

Good luck with the job, Bill