When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
So, after I put this engine in it will have the Headman Headders & Y-Pipe, should I try and replace the Cat with a universal free flowing or just run a straight. I've removed the AIR/Smog crap, I'm deleting the EGR and will only have an O2 Sensor.
As long as you can get an inspection sticker I say go for it. Cats are only free flowing because they are not very effective. I've never put in a free flowing cat that I didn't have to tune out the rear 02 sensors on. So may as well just skip it all together.
I take them off every vehicle i can. Some folks say it makes em smell bad..I haven't ever had that problem. Cats are much better than they used to be im sure but if I didn't have to I wouldn't run one.
Pay the 100 - 125 bucks be legal, and reasonably protect air quality. Unlike the 1970's pellet bed POS cats monolithic cats flow fine. Walker, Magnaflow Thrush, High make a good working high flow cat that have decent flow and velocity without tanking performance. Napa units are Walker or Magnaflow I run cats 1/8 - 1/4 inch over inlet pipe size. Unless you're running serious boost you will have plenty of power and still be legal.
As long as you can get an inspection sticker I say go for it. Cats are only free flowing because they are not very effective. I've never put in a free flowing cat that I didn't have to tune out the rear 02 sensors on. So may as well just skip it all together.
Indiana is an Inspection Free State. Got rid of the inspections back in the late 70s when I was a kid because the system was corrupted. Any auto shop or state ran inspection location could be paid off. Then, according to what I heard when I was a kid, the newly hired State AG, by the newly Elected Gov. rounded up all of the corrupted State officials and prosecuted every last one of them. Don't know how true the story is, that's what I remember hearing when I was around 8 or 9.
Don't know how true the story is, that's what I remember hearing when I was around 8 or 9.
Yeah, 8 year olds are usually a solid source of political facts.
When I was 8 years old I thought Democrats would take all my pennies. Turns out I was right actually so I guess that's not a good example.
Pay the 100 - 125 bucks be legal, and reasonably protect air quality. Unlike the 1970's pellet bed POS cats monolithic cats flow fine. Walker, Magnaflow Thrush, High make a good working high flow cat that have decent flow and velocity without tanking performance. Napa units are Walker or Magnaflow I run cats 1/8 - 1/4 inch over inlet pipe size. Unless you're running serious boost you will have plenty of power and still be legal.
Unless it's done at a repair shop, I don't have to put one back on and still be legal. Only auto repair shops can't let a vehicle that comes in without any part from an emission system missing leave the shop without it being replaced. Home Mechanics are not bound to that. I was hoping someone that saw this post would tell me what the length of the Cat or the Straight Pipe should be. My 85 Z28 has a square flange on each end of the Cat. If I do indeed get a Cat just for Sh*ts 'n Giggles, because I don't have to put one on, I'm hoping someone can point me to a High Flow Universal with either Flared or Non-Flared ends. The Headman Y-Pipe does not have the Square Flange because normal 3rd Gens don't have it either, after model year 1985.
Yeah, 8 year olds are usually a solid source of political facts.
When I was 8 years old I thought Democrats would take all my pennies. Turns out I was right actually so I guess that's not a good example.
It was my Dad I heard it from. Who he was talking to, that I can't remember. I listened to everything my Dad said when it came to vehicles. I remember being 4 when he drove his 72 F100 around the back of the house through the yard to change out engines because my Mom wanted a bigger camper then the pop up we had. He ran over my tricycle driving back through the yard. He yelled to me, because I was crying about it, "Well, Hell. It shouldn't have been out in the way!" Thing was, it was under the bush at the corner of the house, it was way out of the way because Dad said "Move your stuff out of the way". I remember that because it was traumatic that he ran over my tricycle! I was 4, for crying out loud!!! LOL
Anyway, I was always hanging around him when he was working on vehicles, while my brother (the one named after him) could care less about working on them. That's where I learned the basics, and it just grew from there.
Yep, it was my dad that told me Democrats would take my stash of pennies. He had a '69 F250 and he would take me to the mountains to cut our firewood and haul it home. I had no idea he was building memories for me to have. Life was different back then. We worked for fun. LOL!
Due to rust I had to cut off the inlet to my cat. As a result of cutting it so short and without a welder the adapter that I installed is leaking. So, I too am in the market to find a solution. I did find this link https://www.thirdgen.org/forums/exha...elete-kit.html
If you took your smog pump stuff out then you should not run a stock style cat, it will clog up.
I was thinking of getting into welding tube for my next project. Mainly so that I can build a Cat bypass system with a cutout valve. To me, that seems the coolest. Flip a switch- it's bypassed, flip it again, it's back inline.
They do stink without them. And yes, the catalytic converter really does clean a lot of crap up.
Lastly, if you are making big power, I suspect cats become a problem for us. Near stock levels- probably not that big of a gain.
If you took your smog pump stuff out then you should not run a stock style cat, it will clog up.
I was thinking of getting into welding tube for my next project. Mainly so that I can build a Cat bypass system with a cutout valve. To me, that seems the coolest. Flip a switch- it's bypassed, flip it again, it's back inline.
They do stink without them. And yes, the catalytic converter really does clean a lot of crap up.
Lastly, if you are making big power, I suspect cats become a problem for us. Near stock levels- probably not that big of a gain.
I thought about cut-outs. But I'd need two, one for each long tube. With the power the car makes I would benefit from cut-outs.
Then I remember that I complain about how loud the car is right now and honestly love the way it sounds with the full exhaust so I can't justify the expense of twin electric cut-outs for a few ponies.
If I were to switch the car over to a super quiet exhaust I'd love to have twin cut-outs slaved the PCM so it would open them at WOT. Could use the AC circuit to open them up. But would need some kind of hysteresis on the switch so they wouldn't open and close with every upshift/downshift.
I suggest putting a Cat on it. Newer cats are smaller and cheaper than the "old" Cats these cars came with. And they are not much more expensive than the $110 for a delete kit.
He had a '69 F250 and he would take me to the mountains to cut our firewood and haul it home. I had no idea he was building memories for me to have. Life was different back then. We worked for fun. LOL! 
