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~Official~ IS300 Header Thread

175K views 242 replies 73 participants last post by  Bezik777 
#1 · (Edited)
~Header Info Thread ~feel free to add info , ask questions , comments and or concerns.....

Stickys/General
http://my.is/forums/f88/so-one-more-time-headers-385201/
http://my.is/forums/f88/newbie-go-fast-stuff-link-thread-read-here-340884/
http://my.is/forums/f88/is300-bolt-...569-items-now-listed-v3-2-4-15-2009-a-342460/
http://my.is/forums/f62/faq-headers-install-how-tips-tricks-268799/

Megan Headers
http://my.is/forums/f88/megan-headers-blown-gaskets-423777/
http://my.is/forums/f88/catless-loss-power-413228/
http://my.is/forums/f88/megan-vs-obx-421808/
http://my.is/forums/f88/brief-megan-headers-review-video-435903/


OBX/turboeast
http://my.is/forums/f88/best-place-buy-turboeast-obx-headers-295708/
http://my.is/forums/f88/obx-headers-411840/
http://my.is/forums/f88/obx-short-runner-header-381588/
http://my.is/forums/f88/obx-header-question-378801/
http://my.is/forums/f88/obx-short-runner-header-installed-w-pics-346287/

Mazzuri Headers
http://my.is/forums/f88/welds-mazzuri-headers-installed-updated-06-11-09-a-389538/
http://my.is/forums/f88/mazzuri-header-v1-v2-differences-379405/
http://my.is/forums/f88/mazzuri-power-differences-362421/
http://my.is/forums/f88/my-review-story-mazzuri-header-good-bad-ugly-349374/

Dezod Header
http://my.is/forums/f88/dezod-green-header-review-458866/



Ebay Headers
http://my.is/forums/f88/60-hp-headers-422582/
http://my.is/forums/f88/anyone-ever-seen-these-headers-426600/
http://my.is/forums/f88/headers-brand-423294/
http://my.is/forums/f88/jvt-racing-headers-397203/
http://my.is/forums/f88/picked-up-new-header-377680/
http://my.is/forums/f88/header-go-megan-hpracing-jvt-372302/

Magnaflow headers. (49 state legal)
http://my.is/forums/f88/new-headers-magnaflow-headers-vids-up-409481/index3.html

Stock/OE headers
http://my.is/forums/f88/cat-delete-stock-header-446986/
http://my.is/forums/f88/how-heavy-stock-headers-compared-aftermarket-239787/


Y-pipes
http://my.is/forums/f88/analysis-stock-vs-aftermarket-ypipe-aftermarket-header-dynos-209937/
http://my.is/forums/f88/question-megan-y-piping-425079/


CEL
http://my.is/forums/f88/cel-due-headers-sigh-418187/
http://my.is/forums/f88/ok-i-need-help-check-engine-light-424981/
http://my.is/forums/f88/another-megan-header-y-pipe-inquiry-420824/
http://my.is/forums/f88/o2-sensors-cel-code-diagram-381832/
http://my.is/forums/f88/my-header-o2-sim-p0420-problem-357175/

O2 sims
http://my.is/forums/f115/oxygen-sensors-faq-334479/
http://my.is/forums/f206/tokensolutions-pnp-02-delete-write-up-410399/
http://my.is/forums/f206/tutorial-configuring-gen1-5-pnp-delete-diy-resistor-mod-p0420-p0430-408951/
http://my.is/forums/f67/is300-how-install-o2-simulator-342693/
http://my.is/forums/f88/product-review-token-solutions-o2-heater-simulator-delete-391417/
http://my.is/forums/f67/is300-p0161-p0141-o2-heater-malfunction-free-fix-342692/
http://my.is/forums/f88/o2-delete-436099/#post6518893
http://my.is/forums/f88/product-review-token-solutions-o2-heater-simulator-delete-391417/

Header Wrap / Header Heat Shields
http://my.is/forums/f88/header-wrap-416309/
http://my.is/forums/f88/pics-ceb-heat-shield-252138/index4.html
http://my.is/forums/f174/heat-shields-381271/

Questions/Comments
http://my.is/forums/f88/headers-y-pipe-questions-411426/
http://my.is/forums/f88/header-hi-flow-cats-room-405738/
http://my.is/forums/f88/header-opinions-404125/
http://my.is/forums/f88/supra-na-header-can-work-edited-xerd-topic-401200/
http://my.is/forums/f88/cel-problem-headers-393234/
http://my.is/forums/f88/y-pipe-do-you-need-whats-its-392958/
http://my.is/forums/f122/headers-391503/
http://my.is/forums/f88/choose-your-header-obx-megan-mazzuri-etc-348023/
http://my.is/forums/f88/headers-wont-fit-update-355242/
http://my.is/forums/f88/im-new-want-more-power-my-is300-343378/
http://my.is/forums/f88/my-best-header-set-up-415070/
http://my.is/forums/f88/smashing-bending-firewall-headers-413113/
http://my.is/forums/f88/catless-loss-power-413228/

Sounds
http://my.is/forums/f88/exhaust-sound-rating-337995/
Megan headers
http://youtu.be/HVDI2ZsUxHs
http://youtu.be/VZ7GV3CaSPk
http://youtu.be/pvHQryVRkkE

Alphawerks Headers
http://youtu.be/XoMt6d0N8aI

Toyomoto Headers
http://youtu.be/3MSt-RO5XsE
http://youtu.be/Sp2WV83USV8

HP Headers
http://youtu.be/hd1rLgIxjXw
http://youtu.be/s13qajVlRJw

Xerd Headers
http://youtu.be/7D29NY_7_DQ

Mazzuri Headers
http://youtu.be/btL5jcCCR-Y
http://youtu.be/ljrK9iqOdf0
http://youtu.be/jNhxEHlx3Vw
http://youtu.be/rVLvLUVqbfs

OBX Headers
Short header
http://youtu.be/DjZnLCcnvi4
http://youtu.be/fqi2dEp84wk

Team Lexus
http://youtu.be/eTk0nWApkPM

Just Headers :)
http://youtu.be/faFa_WQXFlI
http://youtu.be/UoJSvOq4z4Q

More info and links coming soon (work in progress)~~~~~~~~~~~~~~~~~~~


Another new header in R+D from Figs

http://my.is/forums/f174/stepped-primary-length-optimized-header-dev-thread-443409/
 
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#149 ·
So I've been looking at Megan and OBX headers, and I like that the OBX B2S1 sensor isn't pointed directly at the firewall, but it seems like they have kind of a shitty collector design. I also like that the Megans are a little longer tube. Anyone know of a header that has the Megan collector design that doesn't point at the firewall? I don't feel like messing around to re-locate the bung.
 
#160 ·
got my megan header and y pipe, did a quick mock up and.... not to bad, but damn these flanges are not flat. Warped from welding, probably why many have problems with leaks.

I'm going to try and using something flat with sandpaper, to square them up.

any good pictures of where I should weld a O2 bung in?? I'm fairly sure I know where to weld it in, but a couple pictures would help, as I want to weld it in and take header for ceramic coat.
 
#165 ·
I'm also going to try this e-vac fitting from vibrant, going to try and put it just after y-pipe merge if it doesn't hit the under side of the car.
You need to have very low back pressure in the exhaust for those to work at all. On most exhaust setups they end up making things worse.
 
#169 ·
-I ordered exhaust manifold gaskets for a n/a supra from local toyota dealer.
-used megan y pipe gasket, squared up flanges with belt sander
-used ultra copper gasket maker on the megan ypipe gasket
-bought bolts for the y pipe at hardware store, didn't trust megan ones.
-cut and welded y pipe to get it aligned with the rest of exhaust, was hitting the frame
-relocated b1s1 b2s1 after the merge collectors, cause b2s1 would hit firewall, and I wanted the sensors to read the whole bank, not just one primary.
-extended o2 sensor wires
-new y-pipe to resonator and res to muffler gaskets.




 
#171 · (Edited)
IS300 newb needs help with headers...

First off, I am fairly new to the IS300 world, and recently purchased an 05 with an automatic trans. I am planning on leaving it N/A for the time being. I found a lot of good info here about headers, y-pipes, etc. but I still have a few concerns with regard to installing aftermarket headers and likely a y-pipe as well. Any help would be greatly appreciated.

1. I am looking at the OBX headers, any thoughts on these? Anyone run the header and/or y-pipe?

2. Would using the matching OBX y-pipe eliminate the problems that I keep hearing about, as far sealing issues between the aftermarket header and factory y-pipe?

3. I see the OBX headers have provisions for the o2 sensors. I should not have to worry about engine codes or emissions right?

4. I didn't see anything about the installation on the OBX headers, are they truly bolt on? Any modification required to the flanges, o2 bungs, clearance issues etc?
 
#173 · (Edited)
Thanks Bezik, and thanks for stating this thread. Lots of good info here, though a bit overwhelming at this point.

To clarify, I would still need an o2 sim because of the lost catalytic converters, despite the provisions for the 02 sensors?

Any thoughts on the supra store headers? (Engine // Air Intake/ IS300 Turbo Kits - Lexus IS 300 Header 2JZGE) They look decent and are priced a bit higher than some of the others I have come across.

Would it be possible to add in a high flow catalytic converter to eliminate some of the smell of gas associated with eliminating the cats?
 
#175 ·
It's a lot more simple then you think ...o2 sim is needed due to cat removal nothing to due with drivability ... Unless your buying a good header I wouldnt over pay for anything else! Figs and dezod are developing headers as we speak. Or I'd wait it out and get mazzuri , xerd , alphawerks, turboeast or toyomoto in that order then all the rest fall under those ...you can add cat in y pipe will help a little with smell .



To above I would never had shortened a stud , better to have just removed stud and re installed after header install .
 
#179 ·
It's a lot more simple then you think ...o2 sim is needed due to cat removal nothing to due with drivability ... Unless your buying a good header I wouldnt over pay for anything else! Figs and dezod are developing headers as we speak. Or I'd wait it out and get mazzuri , xerd , alphawerks, turboeast or toyomoto in that order then all the rest fall under those ...you can add cat in y pipe will help a little with smell .

To above I would never had shortened a stud , better to have just removed stud and re installed after header install .
Do you think that adding a cat in the y-pipe would cancel out some or most of the gain associated with a set of aftermarket headers?
 
#176 · (Edited)
i didnt shorten myself i stacked gaskets seemed easier as i didnt wanna pull the header back off to fit my cut off wheel in there couldve used a hack saw but was bein lazy, but ive seen people talk about cuttin the 1 it was just hittin the #2 pipe from the front when you tightend down. if you had to cut it it would only be about 2 threads wouldnt of did no good to pull the stud still wouldve had same problem unless you replaced the stud with a bolt whitch i didnt think of at the time.
 
#184 ·
It all depends on the company. No one can say for sure how long. Just gonna have to wait. In the meantime, you can get your post counts up to be able to see the for sale thread and see if one if the older model headers pop up for sale.
 
#185 ·
^^^ good things take time Dezod should have something to market in a couple months, I'm one of the few lucky bastards who has a rare good header ( mazzuri v2 leak less with custom 3 in y pipe) I would never buy or recommend a cheap header if you can help it...
 
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