nevermind, I found what I was looking for. exoticmuscle.com

 

But a lot of the big-inch engines don't spin as high (though some do of course). My 383 has a redline of 7600, and it's in those upper RPM ranges where a larger header tube can really help, and having a stepped 1 3/4 to 1 7/8 inch tube cuts down on the problems at low speed of having too-large of a tube.

 

Very nice write up, thank you for this and the pictures! Are you selling the used headers? I've been looking...

 

the TPIS headers are junk. the reason i changed headers in the first place was the TPIS headers had cracks in them resulting in exaust leaks, which was messing with the o2 sensors making the motor run rich. when i removed the TPIS headers the first time to weld up the cracks i noticed they both had numerous cracks, all the way around the pipes, the welds were cracking around the collectors. anyway we welded them up and i ordered the EM headers. when i removed the TPIS headers this time to install the EM headers, i noticed more cracks that were not there before. and there is carbon coming out of the cracks.
the car is soo much quieter now with the EM headers on now, without the exaust leaks.
so noo you don't want the TPIS headers.

 

Please let us know how the install goes. I've had the hooker headers on for six years now and could use a good upgrade. Thay are ceramic coated and look like the day I put them in and no cracks. They are old world now days.

 

The BENDS are to , as much as possible, keep the pipe length equal.

That way if there is any 'natural' scavenging effect ALL the cylinders get to participate in the 'goodness'.
That's a GOOD thing.

The TPIS headers made no attempt to do so.

Also, the workmanship on the EM's is MUCH, MUCH better than the TPIS headers.

 

So, has Exotic Muscle addressed the fitment issues that
bacardioil mentioned back in April with his 1-7/8" pipes?

Big pipes have their place and those who need them can benefit
from them. But there is no point in L98 owners looking for much
more than 1-5/8" primaries. Folks who choose the larger pipes
should do so with the understanding that compromises often
need to be made in order to accomodate the increased sizes
of the primaries, collectors and the rest of the system.

.

 

Bet there was a bit of a difference in the price, as well.

.

 

[QUOTE=Slalom4me;1558258922]So, has Exotic Muscle addressed the fitment issues that
bacardioil mentioned back in April with his 1-7/8" pipes?

wow if i had read that before ordering my 1 7/8 headers i would have stayed away from them.
but i have to say that mine DID FIT PERFECT without any problems. the driver side was close to the mount but did NOT touch.
the pass side has enough room to put my fingers between the mount and tubes, and the tubes do not come close to the a/c heater box.

anyone here is welcome to come have a look at mine in person. i drove it today to work. the muffler shop connected the headers to the exaust this morning.
i am VERY pleased with these headers and would buy them again in a second.
the only bad thing about these is i had to wait @2 months for them and the last tube on the pass side comes very close to the spark plug. thats the only one. the rest have room.
when i put the plugs back in the motor it was actually easier to do with these headers then my TPIS on the pass side. driver side is about the same.
they must have made some changes to them cause i started the install on sat morning and was driving it sunday night.
if anyone wants to have a look for yourself, your more then welcome to come see them.
i have not noticed any loss of power at low rpm, but i havent driven it enough yet. time and the dyno will tell

 

Thank goodness. This news is perhaps the best Christmas
present you could give me, that whole deal last spring was unpleasant.

Glad to read that the issue no longer exists - nice looking pipes ...

.

 

That disappointed individual was my reference as well as another person off line.

Glad to see improvements can and have been made...hmmmm-I like RPM...

 

GS977, what oil pan do you have?

.

 

Perhaps plugs with shorter insulators will help?

Accel offers plugs with short insulators. For instance, their #276 is also
available as #276S.

Look these up at Jegs and Summit. The Jegs site will display a list showing
conventional and short plugs where available.

.

 

its a canton oil pan, it holds @7-8 qts.
i am going to remove the pass side header prob this weekend and slightly bend the tube in where the plug comes close.
the pass side header comes off so easy. so its not a big job.

 

How about a pic of where the tube is close to the spark plug on the passenger side. Are you running factory or aftermarket heads? I would like to be sure that they will clear the large AFRs.

Thanks for taking the time to answer all of these questions, and awesome job on the headers.

Aaron

 

To stray briefly from the topic

AKS Racing and GS977, if you are 'Busa fans, then you may
be interested in the following thread and the links within it...

375 hp in an 850 lb wrapper. (cont...)



The thread is still open, best post to it so this thread can
resume its original course.

.

 

Every product from Tpis is questionable, i bought a flat tappet cam from them, lobes on cam chipped off, and i came accross 2 other members they had same problem, what they do is buy from other vendors and modify it little bit and sell for big price, they dont make any product on thier own.

I have Hooker headers so far so good after 2 yrs and 25k miles on them, but EM headers are piece of art. Thanks for pic's and description, excellent job and is great info for others considering buying in future. Saved this thread for future ref.

 

It looks like the EM header is twenty bucks more then the TPIS.

 

Their QC does not appear to be that great, especially considering the prices they charge. The Y pipe on my TPIS headers needed a lot of "coaxing" to fit properly (though I am still happy with the actual headers themselves).

 

Do we have any dyno results?