OBX Horn turbo manifold worth getting?

[Budteboe]

Is the OBX horn turbo manifold worth getting over a Star manifold? How much Hp or spool up gain is there compared to a Star manifold? What is a good estimate to expect on 20 psi on a full rebuilt engine?

 

[bryanwheat]

I wouldn't use anything obx, their parts are cheaply made.

 

[Alex7747]

what are you asking exactly?

 

[ktgurl87]

What is a "Star" manifold??

 

[Bud92gsx]

Your profile says stock..Your post says fully rebuilt engine..Not fully built engine..

There is no way you can run 20 psi on you stock rebuild on a 420a..

 

[Boostinsideways]

what is a star manifold?
OBX is generally junk.
20psi? On what turbo? Different turbos will flow different amounts of air at the same pressure.
Rebuilt? 4g63? 420a? What internals where used?

 

[TSimage]

Everything OBX makes isn't junk and they carry similar warranties to many other companies. As with many, some items are a good buy, others aren't. The OBX manifold quality has greatly risen and they use thicker/higher quality tubing than many known companies and it shows with their most recent additions.

 

[GsXdSmKingGsX]

Ok. You guys have OBX alllll twisted. Certain products they make have been complained about (I.E. Fuel rails, and camshafts for the 420a). But again, they have some other pretty quality items for the price they sell at. I used one of their manifolds on my first eclipse (420a) and it lasted 3 years with no cracking. It all depends honestly. Dont bad mouth companies that at least are trying to keep our culture alive. Their warranties for parts are next to none which is a scarcely know fact also.

 

[Budteboe]

to the people who want to start arguments. Did I once say I had a fully rebuilt engine?NO. I was wanting to know if the RamHorn turbo manifolds by OBX are better than the Star turbo manifolds(which do exist seriously). Now, for anyone please awnser my question.

 

[ktgurl87]

Are you wanting to push 20psi on a stock rebuild? You may have to upgrade some things on the 420a...

To answer your question.... I would say at this point that the OBX Ram manifold would indeed be better than this other manifold that you're talking about since I have no idea what it is and have never heard of.

 

[95AWD6Bolt]

to the people who want to start arguments. Did I once say I had a fully rebuilt engine?NO. I was wanting to know if the RamHorn turbo manifolds by OBX are better than the Star turbo manifolds(which do exist seriously). Now, for anyone please awnser my question.

Again, what is a "star manifold?"

You referenced a "fully rebuilt engine(whatever that means)" in your post, so we assume that you have recently rebuilt yours.

As others have said, gains depend on how you rebuilt the engine, what turbo your running, what injectors your running and how your tuning. Answer that and maybe someone can help.

 

[ed1380]

I don't know what the star manifond looks like, but the ram horns give a little gain in spool due to smoother flow.

 

[bryanwheat]

to the people who want to start arguments. Did I once say I had a fully rebuilt engine?NO. I was wanting to know if the RamHorn turbo manifolds by OBX are better than the Star turbo manifolds(which do exist seriously). Now, for anyone please awnser my question.

No one is trying to start an argument with you. They are only bringing up the correct questions. You are talking about running 20 psi on a stock rebuilt engine. That will handle 20 psi as well as an engine with 100k miles. Neither will handle that much boost and you will have a blown engine. These people have been there and done that and know from experience.

 

[ed1380]

and 2- a manifold has nothing to do with how much hp you make, or psi output by turbo. It's all determined by the turbo.

 

[Black-Out]

Again, what is a "star manifold?"

You referenced a "fully rebuilt engine(whatever that means)" in your post, so we assume that you have recently rebuilt yours.

As others have said, gains depend on how you rebuilt the engine, what turbo your running, what injectors your running and how your tuning. Answer that and maybe someone can help.

Star makes a iron log style manifold with or without an external wastegate provision I had one on my 420A powered eclipse GS a while back before I sold it. pretty good turbo manifolds indeed......

To the OP I have had OBX manifolds before but not on a diamond-star I used an OBX 4-2-1 header on my 02' WRX for a few years and never had leaks or cracks from it and I beat on that car nearly every day......I think OBX headers are actually fine to use but I tend to leave it at that and only that. I haven't had the nerve to try anything else. That said I liken the use of OBX headers right up there with the likes of say...using a CX Racing intercooler kit or maybe another seemingly low quality e-bay sold part from the net......no moving or electronic parts= low chances of failure. Besides that I've seen more expensive headers have failures (went through 2 Borla headers on the WRX before I'd switched to OBX with absolutely 0 failures) For what its worth I don't see you having an issue if you use either one on a properly set up turbo system, especially the Star turbo manifold.....it's pretty hard to screw up iron...

William-

 

[lostnsand1]

From experience with OBX. They are a good deal if your not trying to pull some serious horsepower. The item I had purchased had inconsistent depths in the header and cracked not long after the installation. Star is dependable. I think it is a hit or miss with OBX though, they stood behind their warranty in my case, and I got mine replaced this was back in 09 so they may have changed quite a bit since then.

 

[ed1380]

I've heard that they started using better materials since then

 

[Black-Out]

From experience with OBX. They are a good deal if your not trying to pull some serious horsepower. The item I had purchased had inconsistent depths in the header and cracked not long after the installation. Star is dependable. I think it is a hit or miss with OBX though, they stood behind their warranty in my case, and I got mine replaced this was back in 09 so they may have changed quite a bit since then.

Had my header back in 05' and didn't have issues with it.....But again mine was for a different car. On that note though the tube leanth for a WRX is conciderably longer and more akward then it is for a DSM, so I would've figured if they were that inferior, I should've cracked that thing in no time,as I was doing alot of 40rolls and drag strip launches on that header. The Borla couldn't take it.
But maybe I was a lucky one....I gained 15whp on that header without changes in the boost pressure, and the car pulled strait to 7600rpm where as with the other manifold It would stop pulling at 6800....It was nice to gain the extra top end flow off the equal leanth design.

William-

 

[boostjnkee]

obx generally produces products of a lower grade. Sometimes you'll get lucky, sometimes you wont. it might last 3 years, might last 1k miles. cheap stuff like that is hit and miss. Is everything obx junk? i wouldn't venture to say so. But remember, you get what you pay for. I've learned in my experiences it's better to wait and get something of better quality. It will save you in the long run. =]

 

[Dert]

I had an obx mani, ran it for about 1500 miles before I noticed exhaust leak starting to get bad. After inspecting it, the flange was warped making it impossible to make full contact on the head, and after matching a gasket to it, 2 of the ports were not even close to being in line with the gasket, one of them being 1/4" off center. I'm not saying they are all junk as I have a buddy that has ran one with no issues, just saying give it a damn good look over if you get one.

Edit: also be prepared for ALOT of underhood heat, these tubular mani's give off a ton of heat making everything under your hood extremely hot and can even heat up your up IC pipes raising your intake temps, just a heads up....

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