~Official~ IS300 Header Thread - Page 12 - Lexus IS Forum
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post #166 of 238 (permalink) Old 06-22-2012, 02:30 PM
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Originally Posted by stjarvis View Post
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.
I'm going to test and see if it will create a vacuum before hooking it to the crankcase.

If it doesn't work, I'll use the included plug.

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post #167 of 238 (permalink) Old 06-23-2012, 12:43 AM
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Random question, is it normal to smell gasoline after header installation? I just slapped on a toyo header to try it out and only annoying thing is the smell of gas...
darn just wondering, but does the smell go into the car? or does it come out the back?
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post #168 of 238 (permalink) Old 06-27-2012, 01:34 AM
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It'll get in the cabin a bit. But it comes with any full header set up cus of the cat delete.

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post #169 of 238 (permalink) Old 07-03-2012, 10:28 PM
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-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.





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post #170 of 238 (permalink) Old 07-04-2012, 02:17 AM
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Very nice work. Looks real good bro.

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post #171 of 238 (permalink) Old 07-14-2012, 11:47 PM
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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?

Last edited by plasticmanhey; 07-15-2012 at 12:09 AM. Reason: can't type
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post #172 of 238 (permalink) Old 07-15-2012, 04:58 AM Thread Starter
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Obx is just a copy of a copy design , yes many have ran them . They install just like any other header . You will still need to run O2 sim to rid of check engine light..

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post #173 of 238 (permalink) Old 07-16-2012, 09:01 PM
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Obx is just a copy of a copy design , yes many have ran them . They install just like any other header . You will still need to run O2 sim to rid of check engine light..
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?

Last edited by plasticmanhey; 07-16-2012 at 09:08 PM. Reason: more questions
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post #174 of 238 (permalink) Old 07-17-2012, 10:17 AM
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im runnin the obx header/ypipe on my car didnt have any fitment troubles other than 1 stud on the motor needs to be shortened a tad. yes to the 02 sim
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post #175 of 238 (permalink) Old 07-17-2012, 11:08 AM Thread Starter
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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 .

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post #176 of 238 (permalink) Old 07-17-2012, 02:16 PM
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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.

Last edited by polish man; 07-17-2012 at 02:25 PM.
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post #177 of 238 (permalink) Old 07-17-2012, 04:16 PM Thread Starter
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Right on ... I know what your talking about I meant re install with bolt like you mentioned ...but you got it to work +

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post #178 of 238 (permalink) Old 07-17-2012, 08:52 PM
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im runnin the obx header/ypipe on my car didnt have any fitment troubles other than 1 stud on the motor needs to be shortened a tad. yes to the 02 sim
Thanks. Good to know about the stud.
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post #179 of 238 (permalink) Old 07-17-2012, 08:55 PM
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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?
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post #180 of 238 (permalink) Old 07-17-2012, 09:03 PM Thread Starter
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Nope ^^^

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