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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 01-12-2012, 05:54 PM   #1
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Pros and cons

Hey guys,
I wanted to get the pros and cons on running LT headers with and without high flow cats. I live in SC were we dont have to get inspected so we dont have to pass emissions.
I wanted to get the opinions of the masses on what the differances would be with or without the high flows. I have a 10 LS3 Camaro 6 speed manual. I also want the gains in power and torque but I dont want the car to be over powering when it comes to the exhaust sound. I want a little louder than stock when idling and WOT.
Any help and opinions would be greatly appreciated. Start laying out the differances guys.
Thanks
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Old 01-12-2012, 06:07 PM   #2
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From what I've been told, the high flow cats are so advanced today that the only difference between running cats and not running cats is the exhaust smell.

I opted for no smell and healthier lungs.
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Old 01-12-2012, 06:12 PM   #3
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I guess the next question is for the extra money for the high flows then, is it really worth it to just have the smell reduced a little. Either way, there is going to be a smell. Just less with the high flows
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Old 01-12-2012, 06:29 PM   #4
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I just went from high flows to no cats. You do get more smell, but basically it's like smelling the exhaust from a 60's muscle car. It was a tad louder. Not much at all. As for power difference. I drove the car a mile down the road and back, so I haven't really driven it since the switch over.
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Old 01-12-2012, 06:33 PM   #5
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we don't have inspections here either.all my friends are deleting the cats on their cars,as will i,when i get my LTs.
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Old 01-12-2012, 06:45 PM   #6
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Sounds better without cats in my opion. I don't run them, but if you want to keep it kinda quite then just run a quite muffler. My car is pretty friken loud!
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Old 01-12-2012, 09:43 PM   #7
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If you have thoughts of adding a SC, you should save your $$ on the HFC's. Many of the SC guys are destroying their HFC's with the added exhaust volume and heat. Haven't heard of any NA guys having any problems though. Just something else to consider.
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Old 01-12-2012, 09:51 PM   #8
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Yeah just run without them. If you not have emissions dont worry about it.
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Old 01-12-2012, 10:07 PM   #9
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Quote:
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If you have thoughts of adding a SC, you should save your $$ on the HFC's. Many of the SC guys are destroying their HFC's with the added exhaust volume and heat. Haven't heard of any NA guys having any problems though. Just something else to consider.

What did you just say? HFCs, NA, SC
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Old 01-12-2012, 10:07 PM   #10
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It doesn't make very much differance in the sound with or without them, correct. I guess since I don't have emissions here and the smell will not be that much worse, I will go without the cats to save some money for other mods. Any other advice is welcomed. Thanks for helping everyone
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Old 01-12-2012, 10:24 PM   #11
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Quote:
Originally Posted by Cpanthers85 View Post
From what I've been told, the high flow cats are so advanced today that the only difference between running cats and not running cats is the exhaust smell.

I opted for no smell and healthier lungs.
I'm thinking your lungs will be ok.

It's really not that big a difference.
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Old 01-12-2012, 10:58 PM   #12
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I deleted cats with the LT's and with no tune yet I have noticed no fuel smell.
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Old 01-13-2012, 08:52 AM   #13
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So I guess the view on the forum is that if your state does not require a smog test for inspection then run LT's with no cats at all.
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Old 01-13-2012, 09:11 AM   #14
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No. The view of some in this thread to this point.
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Old 01-13-2012, 09:13 AM   #15
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My state doesn't require emissions and I run cats.
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Old 01-13-2012, 09:22 AM   #16
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Honestly if you think your car doesn't smell like a$$ after deleteing your cats, have someone else drive it and you follow it for a few miles, it stinks... a lot. Of course you can't smell it that much if you're driving the car. If you have the money just put cats on your car as a favor to every one you share the road with. There really is little or no power difference.
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Old 01-13-2012, 09:27 AM   #17
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Go with the cats -On my previous car, C5 Z06 I got a deal on long tubes with no cats and had them installed as such. The sound was way too raspy for my taste (a tinny, weird sound at WOT) and I honestly felt a decrease in torque down low. I bought high flows and boom - no more smell, no rasp and boosted my low end torque again. In CA I have no choice, but if I did the smell alone with be enough reason. Good luck!

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Old 01-13-2012, 09:31 AM   #18
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Quote:
Originally Posted by bigsquirrel View Post
Honestly if you think your car doesn't smell like a$$ after deleteing your cats, have someone else drive it and you follow it for a few miles, it stinks... a lot. Of course you can't smell it that much if you're driving the car. If you have the money just put cats on your car as a favor to every one you share the road with. There really is little or no power difference.
You're wrong about that. I've stood behind my car. And while there is a difference it's not like you apparently think. Tuned right it's not like you describe at all.

I know what you are talking about having followed really really richly tuned cars or trucks with that smell. But even cats can do that if the car isn't tuned right. You don't know wether or not they had cats. Unless you knew the car. And most don't leave them off for performance, it saves money AND it sound better on most systems.
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Old 01-13-2012, 09:38 AM   #19
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I kept my HF cats with LT's. Car is still loud as hell and makes great power. If you are going to add a super charger, you should check them once in a while. They seem to like to come apart.

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Old 01-13-2012, 12:46 PM   #20
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You're wrong about that. I've stood behind my car. And while there is a difference it's not like you apparently think. Tuned right it's not like you describe at all.

I know what you are talking about having followed really really richly tuned cars or trucks with that smell. But even cats can do that if the car isn't tuned right. You don't know wether or not they had cats. Unless you knew the car. And most don't leave them off for performance, it saves money AND it sound better on most systems.
Eh, I like to drive with my windows down, I hate going on cruises anymore becuase of how many people run without cats. I know it saves money but I think if you can afford to run cats you should. Can you imagine how bad the smell would be at the next c5 fest if everyone eliminated thier cats? I'll have to take your word on it that not all cars are that way, but in my experience I can tell right away and from a distance.
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Old 01-13-2012, 12:58 PM   #21
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Quote:
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I kept my HF cats with LT's. Car is still loud as hell and makes great power. If you are going to add a super charger, you should check them once in a while. They seem to like to come apart.

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Eh, I like to drive with my windows down, I hate going on cruises anymore becuase of how many people run without cats. I know it saves money but I think if you can afford to run cats you should. Can you imagine how bad the smell would be at the next c5 fest if everyone eliminated thier cats? I'll have to take your word on it that not all cars are that way, but in my experience I can tell right away and from a distance.
I actually would have put high flows on my car but it was easier and quicker and less expensive to just bolt the headers up to the Borla. Borla does not do cats.

At first it would water your eyes to stand behind it. But once I had it tuned optimally it was fine. Don't get me wrong, to run it in the garage for a little bit will smell strong but I have yet to have anyone say anything from people I know. Even had a few tell me for having no cats they thought the smell would be bad.

Of course you have to be careful with the tune. If it's too lean it can be a problem. Safer tunes waste fuel and that's what you are smelling. But it can smell like that with or without cats. And yes, I hate it when I'm behind someone and the smell is that strong. But mine just isn't. I'd put high flows on if it was.
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Old 01-13-2012, 02:00 PM   #22
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Decisions, decisions. Lol
Thank you everyone who have given there opinions on having them or not. I guess like everything else, it comes down to what I want to do in the end. i do agree that I dont want my caring smelling terrible for the people behind me when I am pulling away at lights.
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Old 01-13-2012, 02:12 PM   #23
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Decisions, decisions. Lol
Thank you everyone who have given there opinions on having them or not. I guess like everything else, it comes down to what I want to do in the end. i do agree that I dont want my caring smelling terrible for the people behind me when I am pulling away at lights.
Bottom line to me:


CONS;
The performance gains are not huge, you'd have to get cats added if you ever moved to a state that checked, and there can be more fuel smell if not tuned right.


PROS;
There can be a gain in power, the sound is better (depending on what you are looking for), it's cheaper and easier, Al Gore will hate you.

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Old 01-13-2012, 04:31 PM   #24
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I mean if it pisses Al Gore off.......
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Old 01-13-2012, 04:32 PM   #25
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Well there is definately the selling point for me. LOL
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