Says who? After replacing the stock ones with DT shorties and seeing them side by side I can tell you there is definitely room for improvement!
Well I don't know, thats why I ask. Most trucks don't come with Headers from the factory, and from all that I have read, toyota has put a lot of thought into these and they are pretty darn good ones. I could see some dramatic difference if your going to headers for a truck that had none, but just replacing one header for another header unless your planning on Racing seems a bit much to me. Just wondering what kind of improvements people who have made the decision to change them are planning on getting.
Toyota designed the whole system to be efficient, starting most importantly with the exhaust manifold. That’s because, basically, the new Tundra comes with factory headers (most trucks don’t).
The exhaust manifolds on this truck are some of the most sophisticated factory exhaust manifolds you’ll find — they are a 4 into 2 into 1 design, which has been found to be most efficient for moving exhaust gases quickly. The exhaust manifold is also made out of stainless steel, which is lighter than cast iron (the material most manufacturers use) and more resistant to corrosion. The tubes on the exhaust manifold for each cylinder are also of equal length. Often times, factory exhaust manifolds have unequal length tubes, resulting in different back pressures on each cylinder and contributing to lower performance. By making sure that that cylinders all have equal length tubes, the Tundra’s factory exhaust manifolds are as good as most products available after-market.
In short, the exhaust manifolds on your new Tundra shouldn’t require any modification. If you decide to heavily modify the top end of your motor, then you may want to look into a quality after-market header (when they become available), but for 99% of users, the factory setup is excellent.
I put the shorties on for the tq; they are larger than the stock ones and did produce SOTP gains, I did not dyno before/after so I can't give any hard numbers. DT claims around 25-30 tq/hp which is an on a 381 hp truck is less than 10%. I posted pictures on here when I did the install but that was back in Sept/Oct 07.
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SR5 5.7 Crew Max 2WD
Airaid CAI
Borla Dual Exhaust
Doug Thorley Headers
Undercover tonneu cover
Kenwood KDC-MP38U/Alpine 6 3/4 speakers
Luverne SS running boards
Homelink Mirror
TRD Sway Bar
TRD Sport shifter
Amsoil oil/rear diff fluid
Where to buy my headers??
Linear Mode
