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Old 07-22-2019, 07:14 PM   #1
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HKS Super Manifold vs Catless UEL

So I saw that ft86speedfactory got in the hks super Manifold and saw that it was carted but the cat was very tiny. I was wondering how the power would compare to say a Tomei UEL or a catless JDL? Is it a big power difference? Would it be noticeable? I realize the tune affects everything also but a stage 2 tune with the hks vs a stage 2 tune with another brand? Like how different could it be?


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Old 07-22-2019, 08:08 PM   #2
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Depends on the rest of your exhaust setup? Power wise it's not much of a difference between cat vs non cat. It's more of the design of the header. If going with the OFT tune stick with the UEL desgins.

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Old 07-22-2019, 08:47 PM   #3
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https://www.kamispeed.com/products/h...d-fr-s-and-brz

Read up on header design and do alot more research before thinking about any brand of UEL header.

If the runners are not equal length the header design is flawed

Opinions may vary

Physics doesn't
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Old 07-22-2019, 08:55 PM   #4
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Originally Posted by jflogerzi View Post
Depends on the rest of your exhaust setup? Power wise it's not much of a difference between cat vs non cat. It's more of the design of the header. If going with the OFT tune stick with the UEL desgins.

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I was eventually going to do an hks supercharger and go with a ecutek tune.


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Old 07-22-2019, 08:57 PM   #5
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https://www.kamispeed.com/products/h...d-fr-s-and-brz

Read up on header design and do alot more research before thinking about any brand of UEL header.

If the runners are not equal length the header design is flawed

Opinions may vary

Physics doesn't


How do physics have anything to do with what manufacturers have been putting on vehicles for decades? What’s so flawed about it?


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Old 07-22-2019, 08:59 PM   #6
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Originally Posted by 86MLR View Post
https://www.kamispeed.com/products/h...d-fr-s-and-brz

Read up on header design and do alot more research before thinking about any brand of UEL header.

If the runners are not equal length the header design is flawed

Opinions may vary

Physics doesn't
With all due respect, that's a pretty pretentious response to someone asking a simple question. lol Take it easy on the guy.
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Old 07-22-2019, 09:02 PM   #7
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Originally Posted by Howaitoguru View Post
So I saw that ft86speedfactory got in the hks super Manifold and saw that it was carted but the cat was very tiny. I was wondering how the power would compare to say a Tomei UEL or a catless JDL? Is it a big power difference? Would it be noticeable? I realize the tune affects everything also but a stage 2 tune with the hks vs a stage 2 tune with another brand? Like how different could it be?


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You're referring to the UEL header from HKS, right? Not that R-Spec set up with the manifold and front pipe. The HKS was designed more for sound than actual performance. They mention that in one of the HKS exhaust threads on here. If you want the burble but also some decent output, the Tomei and JDL will do better. But if you wanna say HKS loyal, I'd suggest their equal length headers, especially if you plan to do their supercharger. But... if you only want the burble but don't care too much about performance, then yeah, do it! Not many have the HKS boxer UEL header that I know of.
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Old 07-22-2019, 09:03 PM   #8
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You're referring to the UEL header from HKS, right? Not that R-Spec set up with the manifold and front pipe. The HKS was designed more for sound than actual performance. They mention that in one of the HKS exhaust threads on here. If you want the burble but also some decent output, the Tomei and JDL will do better. But if you wanna say HKS loyal, I'd suggest their equal length headers, especially if you plan to do their supercharger. But... if you only want the burble but don't care too much about performance, then yeah, do it! Not many have the HKS boxer UEL header that I know of.


Couldn’t I just gut the cat?


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Old 07-22-2019, 09:08 PM   #9
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Couldn’t I just gut the cat?


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Of course you can. Also here's the thread I was referring to:

https://www.ft86club.com/forums/showthread.php?t=104590
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Old 07-22-2019, 09:15 PM   #10
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Of course you can. Also here's the thread I was referring to:



https://www.ft86club.com/forums/showthread.php?t=104590


Yeah I’ve read over that thread awhile back. I got interested in the hks parts when I realized that I have no ground clearance with my GReddy Evo Gt catback exhaust. Therefore I wanted to swap over to something else and the hks ones seem to have better clearance. Then it got into finding a header. Stuck on a Tomei or JDL but the hks ones look nice. I just don’t want to do the EL because I’m not trying to sound like a 90’s Honda riding around.


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Old 07-22-2019, 09:23 PM   #11
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Yeah I’ve read over that thread awhile back. I got interested in the hks parts when I realized that I have no ground clearance with my GReddy Evo Gt catback exhaust. Therefore I wanted to swap over to something else and the hks ones seem to have better clearance. Then it got into finding a header. Stuck on a Tomei or JDL but the hks ones look nice. I just don’t want to do the EL because I’m not trying to sound like a 90’s Honda riding around.


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What HKS exhaust do you have? I have Cosworth EL headers with the rest of my HKS set up and it sounds pretty throaty still.
Also, the HKS uel headers do look pretty cool, imo. Also that tiny cat in it is unlikely to affect performance whether you knock it out or not. Honestly, I say go for it if you have to money.
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Old 07-22-2019, 09:31 PM   #12
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What HKS exhaust do you have? I have Cosworth EL headers with the rest of my HKS set up and it sounds pretty throaty still.

Also, the HKS uel headers do look pretty cool, imo. Also that tiny cat in it is unlikely to affect performance whether you knock it out or not. Honestly, I say go for it if you have to money.


I don’t have an hks exhaust yet. Still running the GReddy Evo Gt set up. But I was looking at those carbon tipped spec l ones.


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Old 07-22-2019, 09:51 PM   #13
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I don’t have an hks exhaust yet. Still running the GReddy Evo Gt set up. But I was looking at those carbon tipped spec l ones.


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Oh nice choice!
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Old 07-22-2019, 09:54 PM   #14
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Oh nice choice!


I wanted something similar to the sound of my GReddy catback without having to worry about rust and better ground clearance.


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