Do you really need the Check Engine Light Eliminator Adapters for this install? I thought with HFCs the setup is fine?

I have my DT headers and HFC arriving tomorrow. I just am ordering the Stage 8 fastner kit, 2x 2-bolt flanges, 2x exhaust gaskets and 2x OEM header gaskets. Right now I want to see how it sounds with the stock y-pipe but I will most likely replace that with the URD y-pipe. Is there anything else that is needed?

Yes you do, (2) of them and I have them avail, about $20 total for both,.

Doug Thorley 03-04 headers 5 in stock

Doug Thorley 05-09 headers 3 in stock

Also, the Gibson catback, which pairs great with these headers, there is also a rebate of around $50 I can get you after ordered!

Gibson 4th Gen exhaust

Got em!!! Pics to come later this weekend.

Get around to taking those pics? Post em up if you can.

Would be nice if somebody made this a bolt on install and resell it

The way this is designed, it's the best you can get for the money, where as the Toyota headers are over double the cost and will crack again when around 100k miles.

Doug Thorley 03-04 headers 5 in stock

Doug Thorley 05-09 headers 3 in stock

Also, the Gibson catback, which pairs great with these headers, there is also a rebate of around $50 I can get you after ordered!

Gibson 4th Gen exhaust

Need favor. I few have installed 03-04 DT headers on their 05-09, and I can't seem to figure out who it was. A few guys did it, but I can't find the post....

The reason why people do this is because the 05-09 headers are $120 more, and you can remove the air injection. I'm trying to advise someone that's doing this install can't find who is was that installed 03-04 headers without air injection on their 05-09.

Hope you guys can chime in,.

I mentioned a while back how these headers give 30 HP. It's actually 32HP gain/35 ft lbs of torque!!!, more than I thought! Some said no way, and I said they did and there was a dyno, but where-ever it was hosted the link was broken, etc. Another was done and I finally got it. This is on a STOCK TRUCK, stock cats, etc. With a Gibson exhaust, Volant Intake and high flow magnaflow cats (which I also have on sale right now) this truck would give A LOT MORE, probably 15+ more easy. The factory cats are so restrictive that mods like exhaust and intakes help on stock trucks, but no where near what a truck with DT headers would and can do.

BUT, even if you don't care about the power, the gain mpg gains, people have reported on here 2-3 mpg gains. Now, that's if you drive it like you did before the mods, which might be hard for some to do with it being crazy fast after.

Attached Images

 

Has anyone here had the headers installed in Houston? I wanted to check and see before I went out searching for a shop to do this at...

I can find a place for you easily. Part of my job is helping people find an installer that may not know where to look. Call or text me 717-319-2100 and I can go into more detail, etc.

Has anyone with the DT short headers in CA had issues failing smog? my 2004 OE V8 headers are cracked and I'm trying to upgrade but don't want to have issues with smog. I'm wondering if i paint them flat black and weld on the OE heat shields if they will go unnoticed...

long tube headers with factory y-pipe cats or aftermarket y-pipe cats (without restricted crimped tubing) would allow for no welding. however by adding o2 sensor bungs after the cats can it be made to keep the cel off?!?!

I'm happy, very happy to report that I talked doug thorley into making the shorties CARB APPROVED. So yes, this won't be an issue and you will pass with the shorties...

Correct. I now have the LONG TUBES IN STOCK and the new Y PIPE, these will never be carb approved of course as these eliminate the catsm but mosts states don't care.. Call or text to order, 717-319-2100

Did this just happened? I don't see CARB EO numbers listed on DTs site.

You won't see it on their site yet. It's been submitted and can take sometimes a few months to get it. Yes, as of last week. I've been bugging them for the past year, but you gotta understand this costs $5,000 PER PART number. You have 03-4 shorties which is one part number, 05-09 which is another, that's 10k. But found a way to get them all done under one part number which saved half the cost! They've been submitted. That means in a few months there will be carb number than everyone will get that bought these for CA So, if you want headers, you can order now and then you'll be good as smog in CA is every 2 years. The prices of these headers will only GO UP with price increases due to the steel tarriff's. They are a deal right now though.