Will after market headers without catalytic converter work on my 04 Nissan Titan?

My stock exhaust manifold has catalytic converter built in to the end of them, with 02 sensor. I really need to replace my stock manifold and catalytic converters (single unit), but I don't want to pay 1000 bucks! So could I put one of these aftermarket headers that states that they are legal in my state with out any issues, both mechanically and legally? any help thanks a millionWill after market headers without catalytic converter work on my 04 Nissan Titan?
Legal in your state sometimes doesn't mean street legal, it means off road. to be legal on the street they must be able to pass federal smog standards. You could try after market catalytic converters,

get them off a wreck, good luck.
Unless you have a lot of miles then the cat is likely still under warranty. They are governed by Federal law. A shop that removes smog control items from a street legal vehicle and gets caught would be subject to prosecution and fines. Obviously you could try it yourself but if you get caught, there are some serious penalties.



Without the cat burning exhaust you could see some changes in the engine as the 02 sensor would not get the same readings as being after a cat. Some computers handle it better than others. I am not personally familiar with the Titan as we have not had a customer who had one tuned without a cat.Will after market headers without catalytic converter work on my 04 Nissan Titan?
Catalytic converters are only warrantied to 80,000 miles.



I assume your manifolds are cracked? The Titan's are notorious for this.



I also hate to tell you that you're not going to be able to replace them for under $1000.



I assume you want Long Tube headers? If so, then you can get OBX long tubes on ebay for around $390. BUT keep in mind, without a proper tune, you MAY run lean which in turn will eventually melt holes through the top of your pistons.



Long tubes are only off road legal, but if you live in a state that doesn't do smog tests, you'll be fine driving it on the street.





You DO NOT want to get shorty headers. You have to have catalytic converters welded on to them and will end up costing you a good bit more than long tubes.



If you need any more info feel free to email me and I'll help you out all I can.Will after market headers without catalytic converter work on my 04 Nissan Titan?
Your second O2 sensors with headers will not see the correct oxygen mixture SES light will turn on. Those second converters you talk about do not actually exist those are front tubes. The only cats are located between the AF sensor and O2 sensor. I have installed superchargers and headers on titans your in for quite a surprise because the nuts and studs are even more difficult to tighten with the header tubes in the way. Do not drive a truck under high load with weak crumbling cat converters. Chunks of the cats blow back into the motor and soon you will need a motor and cat pieces will clogg the exhaust. Make sure you also have the IPDM relay replaced (recall) Good Luck