Hi would a 1986 240 sedan exhaust system fit a 1990 240 wagon.
Upto the axle, yes. Not sure after.
I assume you mean from the engine to the rear axle?
Yep, they share the same wheelbase.
I've put '70s exhaust on an '86....pretty sure it's all the same.
I've swapped wagon and sedan exhausts with impunity too...
Just FYI, not to hijack, but I have a really nice 4-2-1 exhaust header that's been thermal coated silver for a 2.3L for sale if you're interested....shoot me an offer. I've got $400 in it.
After the axle is the same as well iirc