924Board.org

[cs]

does anyone know where i could get a test pipe for a 931. would i be better off just going to a good muffler shop and having them make me one.

[larso]

What are you going to do about the wastegate out pipe, since it enters right into the cat?
I would get a test pipe, or a cherry bomp cigar muffler in place of the cat, and put a seperate straight pipe from the wastegate pipe out the back

[cs]

yeah that's the biggest problem i'm having is that the waste gate goes right into it. i saw a test pipe for sale at AA, but that's out of the question. i think a good shop could rig something up. maybe cut off the old connector and weld it onto a straight peice of pipe.

[Dave]

What happens If you just dont connect the wastegate to anything. Just run a pipe to nothing.

[larso]

yes, as long as you rout it to the back of the car Dave.

It will sound nice.

I think the wastegate pipes should be bigger than they are...your wastegate opens up at high RPMS, so get a bigger pipe if u want.

[numbers]

You probably wouldn't notice any difference with a test pipe, because your cat probably doesn't have anything in it. The ceramic that the catalyst was attached to gets hard and crumbles after a few years, and it all goes out the tail pipe. To check it, just remove your cat and look inside with a flashlight. You probably just have a hollow 3 1/2 shell. Better than any test pipe, and your waste gate pipe still fits. If there is still anything in your cat, just take a long screwdriver or some other long metal rod, and break it up an dump it in the trash.

[larso]

cat's r heavy though and they still aren't as smooth flowing as a pipe right? since the exhaust has to go through something big for a few inches, and then go into something small when it hits the end of the cat.

[924 turbo]

Hollow the cat out if you don't have to worry about emissions. Everything else is too expensive for the small difference it will make.

[Michael Kouridakis]

My car ('82 931)just passed the NJ inspection for emissions. My car still has the original cat and all pipes. I wonder if the cat has any catalyst left in it. I can't believe that it passed. Turbos kick booty.

[-nick]

my '77 cat was actually in pretty good shape before i gutted it out a while ago. it took some muscling to get all the ceramic out. i always thought they were pretty indestuctible. have you had problems with them in the past?

-nick