Removal of rear cats

Black&Gifted

Black&Gifted

New member
Had the rear cats removed this past weekend. Went smoothly and shop did a real nice job. Some pics of the process. Was also very impressed how good the car looked from underneath, particularly for being 14 years old.

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A smart tech would of unbolted the back section of the rear cat area, expanded it and slid the new pipe inside for a proper airflow. Having the stock tube inside the new tube creates a lip inside. Not that you would really every notice a difference.

Either way enjoy the increase exhaust noise!!
 
If they had slid it inside, it would have decreased the overall diameter.. I can't see how one is better than the other for that miniscule amount.. It's not cylinder heads where flow velocity matters..
 
This has been on my mind and I'd like to hear your opinion of the differences in sound or performance. I have Super 40's and delete tips so it's a lot louder than OE already.
 
Exhaust is 100% stock except for this.

On start up and idle, it is a bit louder and deeper. Not piss your neighbors off type loud start up though.

Sound on acceleration is deeper, more throaty and more noticeable. May also be a bit raspier, but if it is, that is definitely secondary to the other sound benefits.

Sound at idle and cruise is about the same or perhaps a hair louder. Haven't noticed any drone either.

For "performance," I would say it is really just more responsive. Gets up and goes "better." Similar to how I'd describe installing a CAI. Doubt there are any true or meaningful HP/TQ gains.


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ctrlraven said:
A smart tech would of unbolted the back section of the rear cat area, expanded it and slid the new pipe inside for a proper airflow. Having the stock tube inside the new tube creates a lip inside. Not that you would really every notice a difference.

Either way enjoy the increase exhaust noise!!
Click to expand...



Now that you mention it, that would have been a good way. But you're right, not really going to adversely affect an effectively stock NA engine.


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BAD MERC said:
This has been on my mind and I'd like to hear your opinion of the differences in sound or performance. I have Super 40's and delete tips so it's a lot louder than OE already.
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When I first deleted my rear cats I had the same setup. I didn't notice any increased performance since the mufflers are chambered and the stock pipes are small.
Sound increase was nice, wasn't earth shattering but the exhaust note/tone just sounded better, kinda more like you would expect the car to sound like.

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Should have had the mid-pipe upgraded to 2 1/4" from 2" while it was up on the lift. That's the choke point in an otherwise fairly decent flowing system on a stock car.
 
Mr. Man said:
Should have had the mid-pipe upgraded to 2 1/4" from 2" while it was up on the lift. That's the choke point in an otherwise fairly decent flowing system on a stock car.
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Might as well change the whole thing to 2.5" mandrel bent stainless front to back. lol
 
ctrlraven said:
Might as well change the whole thing to 2.5" mandrel bent stainless front to back. lol
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I wasn't aware of his budget, so thinking the OEM flows pretty well the mid-pipe shouldn't cost an arm and a leg. If he has the budget the 2 1/2" system would be ideal. :)
 
Sorry, no vids but I'm sure there are some on YouTube.

Haven't done mufflers on either marauder I've owned, but hearing marauders with aftermarket mufflers vs rear cats removed, the latter is definitely not as loud. Of course, it depends on the type of muffler.


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Davco said:
I've been debating on doing it for my stock set up. Did you happen to get any before and after vids?

I can't decide on removing the cats or just going with new mufflers. I don't want it to be super loud.
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Rear cat removal is cheaper than adding new mufflers. Go with that first. A lot of people are quite pleased with just the slight note increase.
 
you changed the bolt locations, so later if you add headers, or wanted a catback it will no longer easily bolt up. also old cats are worth $50 each.
 
I am interested in doing this. What did you pay and what should I tell the exhaust guy I need done exactly?

Also, will my check engine light come on?
 
No check engine light.

I paid $80 and kept the cats. So if I sell them, I should come out ahead lol.

I went to a performance shop that I'm sure does this all the time given their current stable. With them, I didn't even have to say much.

I've have it done on other cars I've owned at small independent (perhaps lesser reputable) exhaust shops and my go to line is "I think there is something wrong with the second set of cats on my car. Can you guys check it out." When car is about to be inspected or put on the lift, I just ask them to remove them. Never really an issue.

Perhaps more than I need to do but there has always been other customers in the shop and I didn't want to blatantly say "remove my cats" in front of them.


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Muffler shops normally charge $30 total for both around here. They don't give a crap as long as it leaves their shop with one cat for each bank or they risk a serious fine.


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