Exhaust questions - Toyota Nation Forum : Toyota Car and Truck Forums

mmurray70 · 02-24-2005, 12:52 PM

I had to get a flex pipe installed on my 93 4cyl this past weekend. While the car was on the lift I had a good look at the rest of the exhaust and it all seemed pretty good except for both of the cat joints. I decided to just have a piece of pipe installed there and get rid of it. I know by doing this the car will be a tiny bit louder, but It ended up being alot louder then I expected. Its kinda annoying. It idles extreamly quiet and in the higher rpms its fairly quiet too, but around 2000 rpms it makes an anoyying sound and you can even feel some vibration.

Is this to be expected by removing the cat or do I still have another leak in the front of the system somewhere? Most of the sound/vibration seems to be comming from the front of the vehicle. I'm wondering about the resonator, but I dont wanna cut that out too and just have it louder again. Any advice?

500KCamry · 02-24-2005, 01:28 PM

Ususally exhaust problems are with the flexible pipe, that bit covered with a SS braid. The pipe underneath the braid breaks first. Then the braid deteriorates. Ususally the pipe from the manifold to the exhaust system is one piece and includes the cat, it is expensive, but the genuine toyota part lasts a long time.

Most places it is against the law to remove the CAT.

terrastrife · 02-24-2005, 06:15 PM

did you replace the cat with a mild steel peice? thats a no no, if ya gonna replace the cat make sure its THICK stainless

mild steel drones inside the cabin

why were you getting a flex joint for?

Jeeves · 02-24-2005, 07:25 PM

In most places running without cats will also cause you to fail visual inspections (for emissions) in most places.

terrastrife · 02-24-2005, 07:58 PM

yeah no cat = big big fine in australia.

Beaver · 02-24-2005, 08:39 PM

I usually just gut my cat. It looks good, flows good and sounds good.

wildfire · 02-24-2005, 10:12 PM

I had to get flex pipe on mine when I changed my muffler. A stock camry muffler (mine anyways) feeds in from the side. Just about every after market muffler I've seen feeds in from the rear. That's why I had to get a flex pipe...I don't know what the case was with mmurray70 though...

terrastrife · 02-25-2005, 12:59 AM

sure you dont mean a bit of bent pipe?

mobes · 02-25-2005, 01:18 AM

Quote:

Originally Posted by wildfire

I had to get flex pipe on mine when I changed my muffler. A stock camry muffler (mine anyways) feeds in from the side. Just about every after market muffler I've seen feeds in from the rear. That's why I had to get a flex pipe...I don't know what the case was with mmurray70 though...

Back on topic: I don't know if that much mild steel pipe would cause that bad of resonance in the cabin. Mine sure has alot though since switching to a full mild steel system.

terrastrife · 02-25-2005, 07:07 AM

mild steel drones in cabin heaps... i have nfi why im not s scientist.. mild and stainless are like very similar but meh.... my exhasut is mild steel, but my resonator and muffler are matched.. so the muffler kills the sound left from teh resonator... if you get a magnaflow muffler, get a magnaflow cat too.

mmurray70 · 03-01-2005, 02:39 PM

Its just mild steel but I really cant see that being a problem. Stainless is almost never used at any of the muffler shops around here. And it is bent a little to clear part of the frame. Sorry about that.

The piece is welded at the flex and flared/clamped to the rest of the system in the back. Do you think it would be because of clamp? Its real bad around 1800 rpm. If your heading slighly downhill on a highway and it hangs at that rpm its real bad. Fairly loud deep sound and you can even feel a slight vibration in the floor.

I'm not worried about fines, not a concern in my area. And the noise on acceleration can be lived with i guess. Just like to get rid of this vibration if possible. Any other advice?