Cats No Cats
Racer
Joined: Sep 2004
Posts: 383
Likes: 0
St. Jude Contributor '04
I am scheduled to have my cats removed this weekend but now I am concerned with the smell and possibly no gains at all.
I have LT headers but every part of exhaust component is stock on my Z06. So, I am planning to remove cats and replace it with pipes to H-Pipe.
I've read many mixed reviews of no cats. Some say they gains one tenth and some say, they actually lost tq. The smell is a big concern because I do like driving my Z06 as much as I can as long as weather is good so I'm hoping the smell isn't there.
I have LT headers but every part of exhaust component is stock on my Z06. So, I am planning to remove cats and replace it with pipes to H-Pipe.
I've read many mixed reviews of no cats. Some say they gains one tenth and some say, they actually lost tq. The smell is a big concern because I do like driving my Z06 as much as I can as long as weather is good so I'm hoping the smell isn't there.
Burning Brakes
Joined: Feb 2002
Posts: 1,154
Likes: 25
From: Jasper GA
I no longer have the dyno sheets, but the car went from 569 RWHP to 610. BTW, the cats were OEM GM items, so high flow cats might have split the difference. The engine was forged 383, 8.3:1 C.R. running an intercooled T-Trim Vortech at 15 psig.
Racer
Joined: Sep 2004
Posts: 383
Likes: 0
St. Jude Contributor '04
Well, got the cats removed.
Wow, it if friggin loud, I didn't think the exhaust note would be this loud, it sounds like I have no mufflers.
As for smell, there is little more than before but nothing to be concerned with. The only thing I don't like is the when I decel, I get some back firing from the exhaust, it's pretty loud.
I'm going to the track this evening, I'll post to see if there is any improvement on my ET/Trap Speed.
Wow, it if friggin loud, I didn't think the exhaust note would be this loud, it sounds like I have no mufflers.
As for smell, there is little more than before but nothing to be concerned with. The only thing I don't like is the when I decel, I get some back firing from the exhaust, it's pretty loud.
I'm going to the track this evening, I'll post to see if there is any improvement on my ET/Trap Speed.
Pro
Joined: Jun 2004
Posts: 543
Likes: 1
From: Detroit MI
Originally Posted by AOC
Well, got the cats removed.
Wow, it if friggin loud, I didn't think the exhaust note would be this loud, it sounds like I have no mufflers.
As for smell, there is little more than before but nothing to be concerned with. The only thing I don't like is the when I decel, I get some back firing from the exhaust, it's pretty loud.
I'm going to the track this evening, I'll post to see if there is any improvement on my ET/Trap Speed.
Wow, it if friggin loud, I didn't think the exhaust note would be this loud, it sounds like I have no mufflers.
As for smell, there is little more than before but nothing to be concerned with. The only thing I don't like is the when I decel, I get some back firing from the exhaust, it's pretty loud.
I'm going to the track this evening, I'll post to see if there is any improvement on my ET/Trap Speed.
Pro
Joined: Aug 2005
Posts: 571
Likes: 1
From: Virginia Beach VA...originally Burtonsville, MD
from what i understand a good tune will get you through emissions and get rid of any smell. thats the case on my buddies 11 sec trans am runnin jet hot coated hooker long tubes with no cats. hes already passed in md. anybody know the penalty for not runnin cats in md or in florida??? that 2500 CA fine got my pucker factor goin a lil bit.
Jim
Jim
Le Mans Master
Joined: Apr 2000
Posts: 9,725
Likes: 229
From: Motor City Vettes Ringleader
SE Michigan Coordinator
CI 3, 4, 5, 6, 10 Veteran
St. Jude Donor '09-'11,-'13-'14-'15
NCM Sinkhole Donor
Had cats, and then installed new set of LGs x pipe, no cats... No problems, except for extra carbon on the exhaust tips 
No smell in the cabin! I was going to have cats put back on, but i'm saving myself the money for a more worthwhile mod 
No smell in the cabin! I was going to have cats put back on, but i'm saving myself the money for a more worthwhile mod
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