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GTyosh
Active Member
If you're going to do it, do it right. It's expensive. I paid around $1800 for Kooks with high flow cats because I didn't want to worry about failing state inspection tests. Paid around $300 for install. Drove it about a week without a tune. Check engine turned on first day but car ran fine. Paid about $500 for tune from Wengard that included 3 tunes. No more check engine after tune. All together with tax, I paid close to $3000 to add headers to my car. You can pay less for a less expensive brand but do some research and check customer reviews before you make a decision. Headers will make your car very loud with after market exhaust even on "quiet mode". Don't be an asshole revving your car and driving fast through your neighborhood and you'll be fine.
dmbcpa
Member
If you do install LTH, which I did, Lethal Performance has O2 spacers for $100 and has been a great add for me to avoid the CEL P0400+ DTC's. Only had them installed a month ago but they're working great and I haven't had to clear codes yet. Without them, I was clearing codes almost every drive I took with my RTD. I have Stainless Works LTH with high-flow cats and love them. If you want loud, definitely look into it. Catless LTH are really loud and too much for me so I stuck with high-flow cats which was more than enough.
Robottrainer
Well-Known Member
Crap shoot. I put GESI green cats on mine and got a check engine light. You can drive around with the light on if you want, it won't hurt anything but if another code comes up you won't know unless you regularly scan it. It will also turn of the front 02 biasing thqt compensates for front 02 aging.
Robottrainer
Well-Known Member
Defoulers are a bad idea. It will clear the code, but it most probably will make the fuel trim go richer over a short period of time as it screws up FAOSC.Not necessarily. What typically happens when the CEL is triggered after a LTH install, catted or not, is that the rear O2 sensor is now seeing too much flow in the exhaust. So the ECU believes there is an issue with the cats and triggers the codes. This is a somewhat simple fix with something called a "defouler." Essentially, what it does is get the rear O2 sensors up and out of the exhaust flow, which in turn causes the ECU to think your cats are working properly.
You can go the aftermarket cat route on the stock manifolds if you want. While the cats may be cheaper up front compared to the LTH', paying a shop to install them is going to be very costly. That is, even if they will do it. I'd call a few local shops and ask them about doing this. I bet you get two answers. First and foremost, just a plain "no, we won't do that." The shops that will do it, will probably want at least $1K for installation and will probably want to supply the cats. Which will probably be at least another $1K. To replace the factory cats on the factory manifolds, they will have to remove the factory manifolds. Then they'll have to do quite a bit of fabrication to get the aftermarket cats installed. I've included a picture of the stock manifolds/cat setup to give you an idea.
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Robottrainer
Well-Known Member
Check your fuel trims. I'll bet the LTFTs are high
Mustang Tally
Member
Guys just wanted to know if it’s worth getting headers for the car it’s a 2020 GT rhd UK. Bit of a newbie to the Mustang customisation arena and could use your advice. I’ve seen this off eBay and is it a good deal or worth doing?
Tally
Tally
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