ok guys need some help, I just put my OBX 4-2-1 header on and now when WOT I hear a leak. Picked up some sea foam to help locate the leak and it l think I have pin pointed it to the donut gasket.... so where can I get another one with out paying an arm and a leg...thanks guys

 

get a new decent one from toyota dealer.

Here's a cool site...
https://www.1sttoyotaparts.com/partscat.html

 

I tried to do this today. COULD NOT TAKE OFF THOSE 2 DAMN BOLTS!!!! i was frustrated as hell, took me 3 hours. Then i had to put it all back together and decided to let a shop do it! There is just NO space to work with down there with those 2 bolts! Craziness i tell you! i'm just so damn ____ed right now.....i did everything in the write-up, it just doesn't work with the xb...Going to cost me like $200 to get it done at a shop and I think it's worth every penny.

 

I'm barrel-chested and it was a tight fit under the car with ramps. A lot of crying and P B'Laster helped get the job done. Remember, they are spring-loaded bolts. This means there's another force that is hold those bolts on tight. A cheater bar and a friend close to a phone to call 911 helps a ton.

 

isn't there a "special tool" to take those off?

 

you guys think the mechanics at a dealership could take off that rounded nut on my header?

 

They should be able to. They're also the kings of making the nuts round. No offense. Personal experience.

 

No special tools needed. You'll need an extension for the socket wrench so you won't have to reach your hand in too far. I also combined a pipe to extend the handle of the socket wrench for more leverage. With steady hands you'll be able to unscrew those 2 spring bolts with no problem.

 

Just a Q to everyone who's installed this on their box: Have you noticed an increase in gas mileage? I'm looking to get the best mpg and I can pick one of these up cheap.

 

Nothing noticable in my case.

 

Any decrease? Any difference at all? Is it worth putting on? A friend said that with the 02 sensor moving, it could hurt more than help the mpg... Any thoughts?

 

I'm happy with it, was noticable in the high RPM range, seems to have a little more oomph up high, i did an exhaust and intake too, around the same time, and to me it was worth it. I have the DC, and i didn't have to move the 02 sensor.

 

What do you get for gas mileage with all your mods?

 

I get 32/33, but i'm not easy on the skinny pedal at all. i commute 30 miles each way on the freeway, run 70/75mph most of the way.

 

Going to try this install today. Got an ebay header so I'll see how well that works out for me. I have an ebay exhaust that I've had on for the last 50,000 miles, and it sounds great! Not bad for ebay.
This write-up seems pretty simple. Not too many steps to install a new header. I'm just fearing those dreaded spring-loaded bolts everyone has been talking about. I have 73,000 miles on my '06, so hopefully after some good WD-40 love I'll have no problem with these bolts.

 

hit them with PB Blaster every day for 4 or 5 days before your install. you'll be happy you did!

 

dude, get ready for some major crying! here is my story: https://www.scionlife.com/forums/sho...d.php?t=180727

 

Has anybody tried doing this with air tools? Good grief, those spring-loaded bolts are tough. What doesn't help is the lack of arm room I have to work the socket wrench.
Also, I like how you can't even see the 5 screws on the header. I just have to feel my way to each one??
With time I probably could have finished this today, but I had a very small time frame to do it.

 

Yes, you cant see them making it 10000000x more difficult. they are practically welded on there, they are so tight. i give you kudos if u finish tongiht. check my first post right above yours on this thread about my story

 

With the help of one other person, we were able to change out my header in about three hours. Having never done the swap before, I'm sure it could be done in less than one hour with the right knowledge and tools. Peanut Butter Blaster is your friend.