I had an exhaust leak on my car. So I looked under the car and there is no gasket between the catalytic converter and exhaust. But I also noticed no nuts or threads on the bolts from the cat to the exhaust. Have attached pictures to help.

Is this normal?

 

looks like a damn greasy vagina with some old dirty grinch fingers bro. Otherwise, I don't think it is.. never seen anything like this.

 

There should be a triangular gasket lol. Not to mention it should be completely sealed. You're going to have to grind/drill or knock out the old bolts, get a new gasket, and some new bolts. Cats get ridiculous hot so bolts tend to rust and stick in hardcore.

 

Thanks. Knocked the bolts out. Got the gasket and new bolts.

 

Hey man I was wondering if you could give me some info? Im having trouble finding the right size bolts to fit in that hole my catalytic converter looks just like yours. I have to put 6 bolts on the front and back of the converter. What size bolts did you use? Everything I'm trying is either too big or too small nothing perfect. No auto parts places around me have anything for it either.

 

https://www.acuraoemparts.com/auto-p...aust-pipe-scat

 

The Bolts are m10-1.25x25. I don't know the exact length but just going off of the thickness of two exhaust flanges and one nut, it should be about 25mm long. The nut is then m10x1.25, and has to be self locking as any exhaust nut is. Don't go to an auto parts store for your nuts and bolts, go to an actual hardware store like True Value, Ace, or Lowes. Try to get class 10.9 strength bolts and get them in stainless steel. They'll hold up A LOT longer than the oem bolts if you get them in that. All together you're looking at spending about $10 at a hardware store for 3 really high grade stainless steel bolts and nuts. Remember, nut has to be self locking. Or, you get the original Honda stuff here - bolt, nut. And remember, websites like those show you everything that's on your car and their part numbers so you'll always have a way to get any bolt that's on your car. No need to ask on here what size a bolt is.

 

There is no triangular gasket on the oem exhaust. The gasket is the round ring in the center (you can see it in his picture). Aftermarket exhaust will have the triangular gasket.

 

Yes, the o-ring gasket for that connection is OEM. But if you're rusted as that pic, you'll have to make do with a triangular gasket. Buy a piece of crush gasket and cut it out. Sand everything as flat as you can get it. Might have to cut and drill the bolts off.

As opposed to the tapered doughnut gasket (uses spring loaded bolts to account for flex), this side just has normal bolts with lock washer and nuts. Just get some bolts that are long enough and problem solved.