Quote:
Originally Posted by DoctorPopcorn
Please know that I haven't replaced my headers with DT, but with all of the info that I've poured over from a ton of super helpful folks on T4R, I can offer this:
DT longtube headers (deleting upstream cats, connect straight to the Y pipe): you will either need an O2 simulator ( URD sometime has one on their website), or space out your downstream 02 sensors with something like this. With LT headers and deleting the upstream cats, can't recall anyone getting around either of these 2 options.
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Great info, just wanted to toss out another option in addition to the ones you listed.
I've recently moved to LT headers from ST headers due to less than stellar work by my mechanic's fabricator. In doing so, I wanted to retain catalytic converters because tread lightly. If I'm rolling through a national forest and stinking up the place, I'm not being a very good steward of our resources or a very good neighbor to those I'm passing or near...
Anyways, here's what I did.
I moved the GSport cats from their original location in front of the y-pipe, to the DT Y-pipe. Specifically, I removed the resonators in the y-pipe and replaced them with the cats. I plugged the O2 sensor bung just behind the flange of the DT y-pipe and had my fabricator weld in new O2 bungs behind the cats that are now installed in the y-pipe for the downstream O2 sensors.
It does take a little bit longer for the cats to warm up and start working, but I've not gotten any codes since completing the work. Few pictures showing what I did in case the above is clear as mud. lol.
Showing the DT y-pipe with O2 bung plugged and comparing the size of the resonator to GSport Cat.
Driver side with GSport cat replacing resonator and new O2 bung for downstream OS sensor.
Passenger side finished as above.
One of the most interesting things I noticed, is that now at about 70 MPH, I'm running 100-150 fewer RPM than before when I had the short tube headers.
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'09 V8 Limited | Dobinsons Lift | Front: 3" - C59-302 + GS59-220 | Rear: 2.5" - C59-675V + GS59-701 | Tires | Ridge Grappler 275/65/18XL | Wheels | Method Standard Machined Finish 18x9 -12 offset | SPC UCAs | DT Long Tubes |
GSport 2.5" Cats | DT Y-Pipe |
Magnaflow Cat Back |
2.5" Vibrant Ultra Quiet Resonator