: Question about an exhaust mod on a '93.



4cammer
03-24-09, 06:26 PM
I'm new to these cars. Just got it last night. Needs a muffler and wondered about the practicality of substituting pipe instead of replacing the muffler. My thought is the cat con and rear resonator would muffle things enough. Might help efficiency and less expensive of course.

Opinions?

Thanks,

Skip

jayoldschool
03-24-09, 07:07 PM
It will work, and it will be LOUD. I did the muffler delete on one of my earlier cars (94 Caprice with an LT1), and it was reasonable at start up, and driving around. Full throttle was ridiculous. A single exhaust will be a little quieter, of course, but still not very "Cadillac"...

4cammer
03-24-09, 08:39 PM
Thanks Jay. I appreciate the warning.:D

dirt_cheap_fleetwood
03-24-09, 08:55 PM
Just slap in a Flowmaster 80 series or one of the mufflers made for large displacement pickup trucks and it will greatly reduce the resistance in the exhaust system. It will keep it quiet but add a little bit of grumble to it.

4cammer
03-25-09, 12:50 AM
Just slap in a Flowmaster 80 series or one of the mufflers made for large displacement pickup trucks and it will greatly reduce the resistance in the exhaust system. It will keep it quiet but add a little bit of grumble to it.

That seems like a good idea.

cadillac_al
03-25-09, 01:26 PM
I don't see how it can be that loud going through a cat converter and a resonator.

75sled
03-25-09, 02:23 PM
not sure about the later model cars, but i lost my muffler a while back on my 75 deville with the 500 cid and I only have the converter in place, and mine isn't loud at all...not even when you get on it.

4cammer
03-25-09, 02:36 PM
Sled, that's interesting it isn't loud with just the cat. Your obviously saying those cars didn't have a resonator.

I'm leaning that way.

jayoldschool
03-25-09, 03:31 PM
not sure about the later model cars, but i lost my muffler a while back on my 75 deville with the 500 cid and I only have the converter in place, and mine isn't loud at all...not even when you get on it.

The "pellet" filled cat on the 75 is WAY more restrictive than the later honeycomb style.

75sled
03-25-09, 03:45 PM
Well it actually does have a resonator, but it is after the muffler and I have no connecting pipe, so it is just the converter. I sort of figured it might be a little different like Jay is saying above.

dirt_cheap_fleetwood
03-25-09, 05:06 PM
It will be loud with just a cat. When the exhaust rusted away on my Fleetwood I had nothing but a cat on there for a few days and I could barely stand to drive the car. Even with the relatively small 4.5 I have it was almost unbearable to anyone inside the car.

4cammer
03-25-09, 08:33 PM
As much as I'm tempted to try this cheap experiment (the shop said $40-$50 to put the pipe in) I'm not sure I want to risk a noisy situation. I thought someone might post who had done it on a '93 FW or a similar year car with single exhaust, cat and resonator.