C7 ARH mid-length
Sr.Random input generator
Joined: Jan 2008
Posts: 7,804
Likes: 2,232
From: Sammamish, WA
AFE leans out the car with the larger intake. Headers on GM V8s usually make the car run richer since ECU overcompensates for the relief in back-pressure, making it richer. Together, you might stay VERY CLOSE TO OPTIMAL with stock tune : ) Sure, you might be losing a bit of potential, but if it is running very healthy with stock tune, that would be the ideal for me. There are way too many negative reviews of tunes done on LT1, from having little to no effect (when run on dyno) to issues with TCM, stability control, PTM, and even things as simple as oil level warning light not working right, since the tuner happened to just copy-paste someone else's C7's map over yours, and it had a dry sump, etc. I would rather avoid it.
Last edited by X25; Nov 30, 2016 at 05:03 PM.
Melting Slicks
Joined: Aug 2010
Posts: 3,063
Likes: 82
From: Tumwater, WA
I did the mids with highflow cats and did a before and after dyno through the process, here is a link to my thread. Now with you adding the x-pipe I would think that is like doing long tube headers and if the cats location is moved or removed then you will probably need a tune. Just the mids gave a good increase all around.
https://www.corvetteforum.com/forums...with-tune.html
https://www.corvetteforum.com/forums...with-tune.html
Burning Brakes
Joined: Aug 2015
Posts: 841
Likes: 53
From: LaGrange KY
I'm running mids with cats, halltech, ported throttle body, x-pipe and sport mufflers. The only thing inline that is stock are the AFM valves (which I hope to delete and add a non obstructed pipe). I am running stock tuning and have had no running issues.
I have an early release mid with cat I picked up from descatesfool which he bought and didn't install on his 2014.
The only issue I have had and it isn't consistent is a CEL from the secondary o2's. Contacted ARH about this and was told that their early release cats where known to do this. They have since replaced these with better cats. I thought I'd replace mine, but was quoted $900 for the new cats! So, I drive around with a small scan tool and delete the code when it pops up.
I don't get the code on the track which is nice, but I get it during normal driving conditions.
I have an early release mid with cat I picked up from descatesfool which he bought and didn't install on his 2014.
The only issue I have had and it isn't consistent is a CEL from the secondary o2's. Contacted ARH about this and was told that their early release cats where known to do this. They have since replaced these with better cats. I thought I'd replace mine, but was quoted $900 for the new cats! So, I drive around with a small scan tool and delete the code when it pops up.
I don't get the code on the track which is nice, but I get it during normal driving conditions.
Burning Brakes
Joined: Sep 2013
Posts: 828
Likes: 40
From: Mountaintop PA
I'm running mids with cats, halltech, ported throttle body, x-pipe and sport mufflers. The only thing inline that is stock are the AFM valves (which I hope to delete and add a non obstructed pipe). I am running stock tuning and have had no running issues.
I have an early release mid with cat I picked up from descatesfool which he bought and didn't install on his 2014.
The only issue I have had and it isn't consistent is a CEL from the secondary o2's. Contacted ARH about this and was told that their early release cats where known to do this. They have since replaced these with better cats. I thought I'd replace mine, but was quoted $900 for the new cats! So, I drive around with a small scan tool and delete the code when it pops up.
I don't get the code on the track which is nice, but I get it during normal driving conditions.
I have an early release mid with cat I picked up from descatesfool which he bought and didn't install on his 2014.
The only issue I have had and it isn't consistent is a CEL from the secondary o2's. Contacted ARH about this and was told that their early release cats where known to do this. They have since replaced these with better cats. I thought I'd replace mine, but was quoted $900 for the new cats! So, I drive around with a small scan tool and delete the code when it pops up.
I don't get the code on the track which is nice, but I get it during normal driving conditions.
