Cats or no cats
Thread Starter
Racer
Joined: Apr 2003
Posts: 286
Likes: 0
From: Ivyland PA
Cats or no cats
I just put B&B bullets on my 2015 and it's still not as aggressive sounding as I want it to be. My plan is to get an x-pipe and I'm not sure if I should go with or without cats.
I had the B&B bullets on my 2005 C6 and they seemed to be much louder!
Any thought or does anyone else have this setup?
I had the B&B bullets on my 2005 C6 and they seemed to be much louder!
Any thought or does anyone else have this setup?
Le Mans Master
Joined: Mar 2010
Posts: 7,052
Likes: 945
From: DFW TX
Headers aren't in the cards? Going without cats is going to make it louder for sure.
However if you're ever going to go with headers the header package will come with a new X and you'll be buying one twice.
Just food for thought. If you ever planned to do headers that's the way Yiure going to get the sound you want. Oh and more power
However if you're ever going to go with headers the header package will come with a new X and you'll be buying one twice.
Just food for thought. If you ever planned to do headers that's the way Yiure going to get the sound you want. Oh and more power
I just put B&B bullets on my 2015 and it's still not as aggressive sounding as I want it to be. My plan is to get an x-pipe and I'm not sure if I should go with or without cats.
I had the B&B bullets on my 2005 C6 and they seemed to be much louder!
Any thought or does anyone else have this setup?
I had the B&B bullets on my 2005 C6 and they seemed to be much louder!
Any thought or does anyone else have this setup?
Thread Starter
Racer
Joined: Apr 2003
Posts: 286
Likes: 0
From: Ivyland PA
Headers aren't in the cards? Going without cats is going to make it louder for sure.
However if you're ever going to go with headers the header package will come with a new X and you'll be buying one twice.
Just food for thought. If you ever planned to do headers that's the way Yiure going to get the sound you want. Oh and more power
However if you're ever going to go with headers the header package will come with a new X and you'll be buying one twice.
Just food for thought. If you ever planned to do headers that's the way Yiure going to get the sound you want. Oh and more power
Pro
Joined: Jan 2015
Posts: 629
Likes: 6
From: North New Jersey
Headers aren't in the cards? Going without cats is going to make it louder for sure.
However if you're ever going to go with headers the header package will come with a new X and you'll be buying one twice.
Just food for thought. If you ever planned to do headers that's the way Yiure going to get the sound you want. Oh and more power
However if you're ever going to go with headers the header package will come with a new X and you'll be buying one twice.
Just food for thought. If you ever planned to do headers that's the way Yiure going to get the sound you want. Oh and more power
Save some cash, get headers and matching x. Then prepare to smile and giggle frequently while driving. Highly recommend Alleve for the eventual muscle cramps in the facial area.
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Racer
Joined: Jan 2015
Posts: 388
Likes: 41
C7 of Year Finalist (performance mods) 2019
I just put B&B bullets on my 2015 and it's still not as aggressive sounding as I want it to be. My plan is to get an x-pipe and I'm not sure if I should go with or without cats.
I had the B&B bullets on my 2005 C6 and they seemed to be much louder!
Any thought or does anyone else have this setup?
I had the B&B bullets on my 2005 C6 and they seemed to be much louder!
Any thought or does anyone else have this setup?
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
I put ARH 13/4 headers and a Halltech carbon CAI on my 2015 z51 M7. Had the Bullets installed several weeks ago. The sound is awesome, I don't detect any drone. I am thinking about going with a Borla x pipe, no cats. You really don't need the secondary cats, no codes thrown and they act like a resonator and tone the sound down. ... but that is a project for next summer.
Tech Contributor
Joined: Jan 2006
Posts: 4,761
Likes: 240
From: Saint Louis MO
St. Jude Donor '14-'15
I just put B&B bullets on my 2015 and it's still not as aggressive sounding as I want it to be. My plan is to get an x-pipe and I'm not sure if I should go with or without cats.
I had the B&B bullets on my 2005 C6 and they seemed to be much louder!
Any thought or does anyone else have this setup?
I had the B&B bullets on my 2005 C6 and they seemed to be much louder!
Any thought or does anyone else have this setup?
The factory X pipe with the secondary 200 cats is not an emissions-control(led) part. It is downstream of the rearmost O2 sensor, and was included on the design to both regulate volume and pass the newer EU pollution control standards.
You will have no issues passing an OBD2/CAN, sniffer, or visual inspection with the factory headers and cats in-place and unaltered, regardless of the type of X-pipe you choose to use. Catless X-pipes are obviously the most popular, as they will increase your sound levels. For all intents and purposes, the C7's emission system ends at the secondary O2 sensor. The EPA rules dictating the definition of 'tampering with pollution/emissions control devices' has no bearing on devices placed downstream of the final monitoring device, at least under current US law. Totally different story in the EU.
Safety Car
Joined: Sep 2006
Posts: 4,364
Likes: 408
From: Greer, SC
In PA, if you put less than 5k per year on your car, it is emissions exempt. At my second home in Wayne County, PA, no emissions is required at all.
Team Owner
Joined: Apr 2013
Posts: 26,243
Likes: 4,361
From: Chirper Island
Unfortunately, the Bullets just aren't as loud for the C7 as they were for the C6. They made the sound lower and more aggressive/less European sounding than the stock/NPP, but they just don't measure up to the Bullets on the C6.
I've had Bullets on four engines, and this is what I've found: This list is the order I've found them to be loudest to "quietest":
LS3
LS2
LS7
LT1
People still stop and look because they are louder than the average, but they just don't measure up to the the LS3.
I've had Bullets on four engines, and this is what I've found: This list is the order I've found them to be loudest to "quietest":
LS3
LS2
LS7
LT1
People still stop and look because they are louder than the average, but they just don't measure up to the the LS3.
Racer
Joined: Jan 2015
Posts: 388
Likes: 41
C7 of Year Finalist (performance mods) 2019
Safety Car
Joined: Sep 2006
Posts: 4,364
Likes: 408
From: Greer, SC
I hope I'm wrong but many people put headers on and get no CEL for a while but eventually get one as the rear O2 sensors don't get hot enough since they are moved further back. Most tuners just tune out the rear O2 sensors.
Racer
Joined: Jan 2015
Posts: 388
Likes: 41
C7 of Year Finalist (performance mods) 2019
The ARH mid length headers don't throw a code. I've had them on my car over 6 months and no codes, no tune either, just better sound and performance.
Safety Car
Joined: Dec 2003
Posts: 3,641
Likes: 2,689
From: Pacific Northwest
Pretty sure the OP is asking about a catted X-pipe... Nobody has responded on that front, so I'll chime in if by chance I'm correct in my assumption.
The factory X pipe with the secondary 200 cats is not an emissions-control(led) part. It is downstream of the rearmost O2 sensor, and was included on the design to both regulate volume and pass the newer EU pollution control standards.
You will have no issues passing an OBD2/CAN, sniffer, or visual inspection with the factory headers and cats in-place and unaltered, regardless of the type of X-pipe you choose to use. Catless X-pipes are obviously the most popular, as they will increase your sound levels. For all intents and purposes, the C7's emission system ends at the secondary O2 sensor. The EPA rules dictating the definition of 'tampering with pollution/emissions control devices' has no bearing on devices placed downstream of the final monitoring device, at least under current US law. Totally different story in the EU.
The factory X pipe with the secondary 200 cats is not an emissions-control(led) part. It is downstream of the rearmost O2 sensor, and was included on the design to both regulate volume and pass the newer EU pollution control standards.
You will have no issues passing an OBD2/CAN, sniffer, or visual inspection with the factory headers and cats in-place and unaltered, regardless of the type of X-pipe you choose to use. Catless X-pipes are obviously the most popular, as they will increase your sound levels. For all intents and purposes, the C7's emission system ends at the secondary O2 sensor. The EPA rules dictating the definition of 'tampering with pollution/emissions control devices' has no bearing on devices placed downstream of the final monitoring device, at least under current US law. Totally different story in the EU.
John