Need some exhaust advise
#41
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![](https://cimg3.ibsrv.net/gimg/ls1tech.com-vbulletin/2000x1504/image_bbde5ee5bc10ad0bac65e3d15973f9b266594ce7.jpg)
And i got to figure out where to have these welded at, i figured have them both pointing each other on the insides, like here
![](https://cimg2.ibsrv.net/gimg/ls1tech.com-vbulletin/2000x1504/image_71d08810e320c348be3685e7698191be65178854.jpg)
Or a lil closer to the flange, and got to find somebody to weld it for me, got one price somebody said for 150 but that seems a little high just to weld these two damn things
#43
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As promised:
![Need some exhaust advise-joues0s.jpg](https://ls1tech.com/forums/attachments/cadillac-cts-v-2004-2007-gen-i/719572d1683234684t-need-some-exhaust-advise-joues0s.jpg)
The headers go through the bottom. You should do a test fit to see if you need to dent the headers before they get coated, because hammering on the ceramic will chip it. Consider the test fit an opportunity to replace the exhaust gaskets and fasteners, and get familiarized with the process of getting the headers in and out. I estimate 4-6 hours for your first try. Be careful when removing the bolt near the coolant temperature sensor--I (and many other people) have broken that plastic connector with a wrench multiple times. Fortunately they're only $16.
Are you running stock exhaust? I bet you're not prepared to connect the headers to the exhaust. This isn't plug and play. This test fit will be a great learning experience. You will probably need some 2.5" clamps (here's my favorite design) and a sawzall but you may need more extensive modifications to get the angle correct. I've only adapted the Kooks headers to a Magnaflow so I don't know what is required for the stock exhaust. I was such an idiot when I first started--I had no idea that this stuff wasn't plug and play and had to cobble together something until I could get to a shop to have my catback slightly modified.
As previously stated you need one extra M18 bung to accept a wideband sensor when you get your car tuned. If it's not there, the tuner will charge you for the necessary modifications (or turn you away at the door if they have a busy schedule), and if your headers are coated, drilling and sanding that area to install the bung will remove some of the coating.
![Need some exhaust advise-joues0s.jpg](https://ls1tech.com/forums/attachments/cadillac-cts-v-2004-2007-gen-i/719572d1683234684t-need-some-exhaust-advise-joues0s.jpg)
Im assuming they both went on through the bottom? And what about the sterring shaft, im sure i have to figure out where to make a dent in the header at, hopefully that dont damge the coating whenever i get them coated, unless I can figure out where to dent it first at but I won't know until I go to put them in and I won't put them in until they're coated.
Are you running stock exhaust? I bet you're not prepared to connect the headers to the exhaust. This isn't plug and play. This test fit will be a great learning experience. You will probably need some 2.5" clamps (here's my favorite design) and a sawzall but you may need more extensive modifications to get the angle correct. I've only adapted the Kooks headers to a Magnaflow so I don't know what is required for the stock exhaust. I was such an idiot when I first started--I had no idea that this stuff wasn't plug and play and had to cobble together something until I could get to a shop to have my catback slightly modified.
As previously stated you need one extra M18 bung to accept a wideband sensor when you get your car tuned. If it's not there, the tuner will charge you for the necessary modifications (or turn you away at the door if they have a busy schedule), and if your headers are coated, drilling and sanding that area to install the bung will remove some of the coating.
Last edited by FuzzyLog1c; 07-07-2017 at 02:09 AM. Reason: Spent 30 minutes learning how to take better pictures.
#44
TECH Regular
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Originally Posted by FuzzyLog1c
As promised:
As previously stated you need one extra M18 bung to accept a wideband sensor when you get your car tuned. If it's not there, the tuner will charge you for the necessary modifications (or turn you away at the door if they have a busy schedule), and if your headers are coated, drilling and sanding that area to install the bung will remove some of the coating.
As previously stated you need one extra M18 bung to accept a wideband sensor when you get your car tuned. If it's not there, the tuner will charge you for the necessary modifications (or turn you away at the door if they have a busy schedule), and if your headers are coated, drilling and sanding that area to install the bung will remove some of the coating.
![Driving](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_driving3.gif)
![Need some exhaust advise-photo67.jpg](https://ls1tech.com/forums/attachments/cadillac-cts-v-2004-2007-gen-i/581023d1499422777t-need-some-exhaust-advise-photo67.jpg)
#45
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[QUOTE=FuzzyLog1c;19668530]As promised:
![Need some exhaust advise-joues0s.jpg](https://ls1tech.com/forums/attachments/cadillac-cts-v-2004-2007-gen-i/719571d1683234684t-need-some-exhaust-advise-joues0s.jpg)
Ohhh i see what your sayin now, duhhh...
But i got the exhaust clamps that came with the connection pipes, and i know ill have to cut them so i already know about that part too, i got a sawzall, i just have to get a good blade. And they will be connecting to a factory Exhaust sytem for now, it only has a muffler delete
![Need some exhaust advise-joues0s.jpg](https://ls1tech.com/forums/attachments/cadillac-cts-v-2004-2007-gen-i/719571d1683234684t-need-some-exhaust-advise-joues0s.jpg)
Ohhh i see what your sayin now, duhhh...
But i got the exhaust clamps that came with the connection pipes, and i know ill have to cut them so i already know about that part too, i got a sawzall, i just have to get a good blade. And they will be connecting to a factory Exhaust sytem for now, it only has a muffler delete
#46
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Im assuming they both went on through the bottom? And what about the steering shaft, im sure i have to figure out where to make a dent in the header at, hopefully that dont damage the coating whenever i get them coated, unless I can figure out where to dent it first at but I won't know until I go to put them in and I won't put them in until they're coated.
#48
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As Fuzzy noted, you'll need to test fit the drivers side, unfortunately. Sounds like a big PITA, but it's really not that bad using the method I described. I had to remove my drivers side recently and had it back in within an hour. Hopefully your bolts are in fair condition and not seized up post-cats. Hit them with some penetrating fluid in advance. The steering shaft is a bit of a pain. You'll need to fool around with it a bit to fit the header past it. If I recall correctly I think the shaft needs to be compressed slightly (pushed in towards the firewall). Oh, and don't forget the spark plugs come out first.
#49
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Over the course of owning my car I've had it on the dyno many times. I've visited multiple dyno shops, and never was having an extra bung a requirement. Every dyno/tuner I've been to has a wide band that's integrated into the dyno, they have a big sniffer they stick in the exhaust tip. I do have a wide band gauge in my car. I put the bung right after the ball flange on the mid pipe so I wouldn't have to cut a second hole in the header. It reads spot on comparing it to the dyno device in real time.
Attachment 581023
![Driving](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_driving3.gif)
Attachment 581023
#50
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Originally Posted by FuzzyLog1c
I would find a better tuner. Catalytic converters work by oxidizing the exhaust byproducts passing through them. Therefore, the reading after the cats will always be leaner than it is before the cats, but not by a consistent amount.
#51
#53
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The cats should unbolt from the catback, cause when i did the driver side mount i hd to take off that cat, and the bolts snapped so i had to torch them out, and i think the dealer un loosend the driver side recently when i had to have the fuel pump recall done, so those should come off fairly good
#55
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Gonna take my headers tomorrow to get the bungs welded in. Do u guys suggest welding them both on the inside, where they would point each other? Just like in the pics i posted on post number 41?
#57
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Found this pic online, figured if i welded them, one on each pipe, on the insides near the flange, facing the tranny, looks like plenty of room to me? Or im wrong. Where would u guys suggest then? Or am i suppose to add them both to just the drivers side header? Im confused
Last edited by Mike ctsV; 07-10-2017 at 07:34 PM.
#60
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Anyone know where i should have these bungs welded in at? I figured id add one to each header, or do i need to add the two extra bungs only to one header, drivers side?