Hey all,

I have an '06 XLT 4x4 which has the two factory cats. I bought two Magnaflow 94306 high-flow cats to replace them with. The guy I was talking to at the exhaust shop said I would need to get some o2 sensor extensions, if I want to put them after the cat.

Does anyone know who makes them or where I could get a couple?

Thanks

NM- They are BBK part number 1676. Found it after much searching.

 

If this was done right, you shouldn't need extensions. He needs to put those cats right where the factory one are. The o2 bungs need to be directly behind them.

 

We'll see. The current harness goes to the middle of the cat. It did not look like there was enough slack to reach far enough back.

Did you have to drill a hole in your heat shield?

 

no.

 

My guy said the same thing... I went home started to search for extensions.. Got a call back a little bit later.. Said they will reach no problem!

 

Mine fit but I have the 94106s vs your 94306. Length difference of 3". And my wiring is pretty tight.

 

I went ahead and ordered the extensions, just in case. Does anyone have a picture of how they were installed? It doesn't look like they will fit in there sideways. Also, did the bung end up on top of the pipe, or on the bottom?

Thanks

 

The #94106 cats fit no issues, the #94306 cats have been reported to also. I believe TruckGuy24 has the #94306 converters in his. Exhaust shop just needs to move them up as forward as possible.

Mounting the O2 sensor sideways makes for easier install, but a tighter fit. Usually best off mounting from the top if they will do it. But a big pain to remove when you need to.

 

Thanks for the info, guys. I'll take a picture, after I have it done next weekend.

 

I have 94106's so no issues here Those 94306's would have been to quiet for my tastes

 

Ha! I'm old. I like quiet 120 decibles for 1 HP gain, isn't worth it in my book.

 

Ok. Just got back from the shop (Pro Muffler and Brake in Everett). Props to Steve for doing an excellent job.

The part number for the o2 sensor (1676) did not fit the trucks' harness. The connector is the same, but we had to grind off the plastic tabs on the male extension because they did not align with the slots on the female stock connector. No big deal, they still work fine and I am not throwing any codes.

Steve also drilled a new hole in the heat shields for the o2 sensors to go through.

I think the following pictures will explain it better than I can. They are not too much louder than the stock cats, which is a bonus in my book.

Drivers side fitment:



Drivers side o2 sensor:



Passenger side fitment:



Passenger side o2 sensor

 

Gettin my hi-flow cat's installed this week.... How did the outcome on yours go?
Power difference? MPG changes at all?
thanks

 

Well, I haven't really driven it much since yesterday, but it is louder than maybe I thought at first. It really screams when I get on it, now. Fortunately, it mellows out quite a bit in OD. It "feels" like the throttle is a bit more responsive in the higher RPM bands. That being the case, I guess the stockers were very restrictive and I hope the MPGs will go up. I meant to check the mileage with the last fill up, but I didn't have my gear ratio and tire size reprogrammed from the gear swap, yet. It would have been way off. I will check the mileage the next time I fill up and report back.

 

What is the difference with all the Magnaflow cat models??