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Old 03-06-2019, 08:37 AM #16
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The only reason I've not considered the Full URD kit with the DT headers is the straight rear exit tip combined with the issue of sulfur smell coming into the cabin.

Has this kit done anything for that smell? I ride with the windows down A LOT, especially the rear window, so I get the sulfur smell frequently. Because of that, I had only short-listed side exit exhausts for when I replace the exhaust system. If I can do the URD kit, I'd do it, though.
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Old 03-07-2019, 02:30 PM #17
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You can always just ask an exhaust shop to lop off the end of the included straight-back MF muffler and weld up a side exit.
Probably $100 all in.
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Old 03-07-2019, 03:41 PM #18
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sulfur smell? bad cats? install cats?
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Old 03-07-2019, 04:32 PM #19
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It's a very common "problem" ...there's a TSB that basically says "it's your hig-sulfur fuel from non-California gas stations, not your cats." A google of "EG003-03" returns multiple results for the PDF explanation from Toyota. On top of that, though, there's another bulletin for excessive sulfur that has the cats replaced, but most have said it's not a 100% remedy. The most common route seems to be doing a side exit exhaust, so seeing as there aren't many reviews of a full replacement using the URD stuff, I wanted to see how the sulfur smell changed (or didn't). I'd rather not spend a bunch of money on a well built cat-back system, y-pipe, and headers only to chop the tip off of it to reroute it from the get-go.
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Old 03-07-2019, 07:58 PM #20
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never smell it. toyota calls for new rear cat and ecm reprogram. my experience is if it smells bad, cat(s) are bad.

according to toyota if its fuel try a different brand, octane or maybe a fuel treatment

Last edited by sumday; 03-07-2019 at 08:04 PM.
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Old 04-01-2019, 08:22 AM #21
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Is the Y's outlet 3" or does the URD exhaust merge from whatever the OEM Y-pipe's outlet (2.5?) to 3"?
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Old 04-01-2019, 09:00 AM #22
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I believe the Y pipe was designed to work with the stock catback. So the outlet is 2.25”

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Is the Y's outlet 3" or does the URD exhaust merge from whatever the OEM Y-pipe's outlet (2.5?) to 3"?
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Old 04-01-2019, 12:50 PM #23
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I have an "03 V8 and bought the Magnaflow y-pipe/cat combo, haven't installed it yet as the effort looks to be more than the payback until the stock cat fails. It was $166. It definitely looks a lot more unrestrictive than the stock but it would be interesting to see before and after HP numbers on just the y-pipe, no other exhaust mods.
I'll put a picture of it on my garage.
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Old 04-02-2019, 12:05 PM #24
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I would love to do the URD y pipe. butttt I'm not quite there yet. maybe in the future... need to run the 1/4 mile first.

anyways, I tried using the search bar with no luck, has anyone installed an Exhaust Cut out? There's a perfect spot right after the flange to the Catback. before the stock muffler, so you'd just be running Cats, "when you wanted to."

anyone have links to threads or something? much appreciated.

p.s. and for that matter, is there a drag racing thread in here?
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Old 12-23-2019, 05:15 PM #25
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Anyone know the difference between URD y-pipe and the Doug Thorley y-pipe?
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Old 12-23-2019, 05:59 PM #26
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Quote:
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Anyone know the difference between URD y-pipe and the Doug Thorley y-pipe?
URD is 304 stainless TIG welded and deletes the stock 2 cats so they can route the driver's side under the transmission pan to merge with the passenger side.

Doug Thorley is 409 stainless MIG welded and replaces the stock 2 cats with 2 resonators but otherwise follows the same path as stock; under the t-case.
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Old 12-23-2019, 06:11 PM #27
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Sounds like URD is higher quality and the pipe does not droop below the cross bar? and also noticed that The URD off road Y Pipe does include ports for the rear O2 sensors. It will not cause a check engine light from eliminating the rear catalytic converters. To my understanding, the Doug Thorley's y-pipe needs o2 spacers for the rear o2 sensors to get rid of the check engine light?

I have on order the Doug Thorley premium headers and looking into either getting Doug Thorley y-pipe or URD. Just trying to decide which is best.


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URD is 304 stainless TIG welded and deletes the stock 2 cats so they can route the driver's side under the transmission pan to merge with the passenger side.

Doug Thorley is 409 stainless MIG welded and replaces the stock 2 cats with 2 resonators but otherwise follows the same path as stock; under the t-case.

Last edited by awhitney1; 12-23-2019 at 06:15 PM.
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Old 12-23-2019, 06:22 PM #28
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Quote:
Originally Posted by awhitney1 View Post
Sounds like URD is higher quality and the pipe does not droop below the cross bar? and also noticed that The URD off road Y Pipe does include ports for the rear O2 sensors. It will not cause a check engine light from eliminating the rear catalytic converters. To my understanding, the Doug Thorley's y-pipe needs o2 spacers for the rear o2 sensors to get rid of the check engine light?

I have on order the Doug Thorley premium headers and looking into either getting Doug Thorley y-pipe or URD. Just trying to decide which is best.
The rear cats that are eliminated with the URD are not needed for the electronics and will not cause a CEL when removed. Both Y's have O2 bungs and both should work as long as you keep the manifold cats. The DT LT headers delete the cats so you'll need spacers or simulators in the Y pipe regardless, to my understanding.

As far as the URD drooping below the crossmember, I'm not sure.
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Old 12-23-2019, 06:26 PM #29
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Thank you for the clarification. With the DT LT, regardless, i'll need spacers that Jason will include with when I get the headers. I guess, there's not much difference to warrant the extra $160 by going with the URD over DT besides different welds.

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Originally Posted by Inv4drZm View Post
The rear cats that are eliminated with the URD are not needed for the electronics and will not cause a CEL when removed. Both Y's have O2 bungs and both should work as long as you keep the manifold cats. The DT LT headers delete the cats so you'll need spacers or simulators in the Y pipe regardless, to my understanding.

As far as the URD drooping below the crossmember, I'm not sure.
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Old 10-20-2020, 03:03 PM #30
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About a month ago, some nice person cut out my driver secondary cat, so my frivolous purchase was warranted. I have to give them credit, though- they made beautiful cuts with whatever blade they were using. Cut my O2 off at the wire, so I still had the plug connection, thank god.

So, I thought about welding custom pipes, getting rid of both secondary cats, looked at the DT Y pipe, but the resonators look too similar to cats and I figured someone might come along and cut one of them out again. Why not spend the $600 and do it right the first time for a lifetime part. That, and I just wanted what was supposed to be my daily driver back, after I bought it because the rear diff went out on my '98 (which is now fixed, but now needs an alternator).

So even though it's spendy, I landed on the URD Y pipe. Granted, it's worth every penny for my situation. The fit was fantastic and the metal work is beautiful. I drove my truck around without the cat for damn near a month with an Xmas tree on my dash. I was sure I had blown out my Air Injection switching valve, as after the install I was still throwing a P0037, P0057, P0102, P1440, and P1443. Turned out to be the 20A EFI fuse that had blown. Switched that out, had two new Denso downstream O2s, and all my dummy lights were cleared and stayed cleared with my code reader. No O2 issues at all, BUT, we have no emissions testing here in MN.

Taking off the factory Y pipe from the catback, one of the bolts snapped, even with the impact on "gentle". So, I was riding around for 5 days with no catback and the new URD Y pipe. A bit quieter than having a secondary involuntary cat delete, but still loud. Got new Bosal hardware and gasket from Napa today, mounted up nicely, but the fit still isn't perfectly flush with the gasket fitting into the factory catback, even with gentle use of the impact. We'll see how long before that gasket blows out, and I don't attribute this as an issue on URD's end, as the gasket fit perfectly onto the Y pipe. Maybe the old gasket is still on there. My stock catback has a rusted-out and missing tailpipe, and a hole started on top of the muffler.

So after all that rambling, the URD Y pipe, mounted up to the stock catback works great- at least for my situation. I drove for a month with my truck on limp mode, but as far as I can tell, acceleration and response feels more smooth to me, but who knows. It's a bit throatier than stock, but still quiet, in terms of what I was dealing with before. No more stolen secondary cats to worry about, and even more incentive to get DT longtubes. I still like the idea of keeping my shi**y, rusted-out oem catback. Maybe I'll rig up a side-exit down the road. Anyway, hope this might help someone else, down the road.
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