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Old 10-02-2012, 09:30 PM   #1
00RS503
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Anyone out there wanna share some knowledge on UEL headers they have upgraded on their STi? I know EL is the way to go for more HP, but I've heard them and if I wanted an Evo, I would've bought one. Anyone have some and noticed any power gains or sound differences?
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Old 10-02-2012, 11:43 PM   #2
subyswamper
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P&P the stock manifold and buy the grimmspeed cross pipe.
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Old 10-03-2012, 10:22 AM   #3
99imprezd
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just checked out the grimmspeed crossover pipe.. swweeeet! http://www.rallysportdirect.com/Grim...rce=GoogleBase Gotta get one. I have heard that going equal length is good for evening out flow and even temperatures between cyl runners.. but hvnt seen any dyno numbers, I love the boxer rumble, no fart can civic sound in my car for a couple horses.. UE all the way.
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Old 10-03-2012, 10:37 AM   #4
Jirv311
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Quote:
Originally Posted by subyswamper View Post
P&P the stock manifold and buy the grimmspeed cross pipe.
I would have to agree with this. Although, my only experience is with the GP Moto UEL headers and they are more trouble than they are worth. Lots of rattles/buzzing even though everything is tight and wrapped and I haven't seen very much to prove they do a lot for these motors. That said, this is for the one set of headers on my motor so I can't really speak for others.

There are quite a number of threads around this topic. I believe some even have some dyno numbers.

I got mine dirt cheap which is the only reason I put them on. I will probably be switching back to the stock manifold soon.
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Old 10-03-2012, 11:00 AM   #5
the suicidal eggroll
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There was a header shootout a few years ago, where the stock, Grimmspeed ported, and various aftermarket EL and UEL were tested. For the most part, EL and UEL added roughly the same power (about 20whp), and the Grimmspeed ported manifolds and crossover pipe made about half that (about 10whp).
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Old 10-03-2012, 12:49 PM   #6
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Quote:
Originally Posted by the suicidal eggroll View Post
There was a header shootout a few years ago, where the stock, Grimmspeed ported, and various aftermarket EL and UEL were tested. For the most part, EL and UEL added roughly the same power (about 20whp), and the Grimmspeed ported manifolds and crossover pipe made about half that (about 10whp).

what about torque on EL vs. UEL?
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Old 10-03-2012, 12:58 PM   #7
the suicidal eggroll
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The entire curve looked basically the same IIRC between EL and UEL.


People make a much bigger fuss about the "inefficiencies" of UEL and the "moar p0wr" performance of EL than actually exists. BOTH are a significant improvement over both stock and the Grimmspeed ported manifold with crossover pipe. Compared to those gains, the differences between EL and UEL are pretty minimal, at least according to that ~10 header dyno shootout.
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Old 10-03-2012, 01:06 PM   #8
the suicidal eggroll
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Here's the post with all of the links. Unfortunately it appears that every single one is down...so I'm just going off of memory here:
http://forums.nasioc.com/forums/show...8#post20922698
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Old 10-03-2012, 01:07 PM   #9
RaceFaceXC
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Quote:
Originally Posted by the suicidal eggroll
The entire curve looked basically the same IIRC between EL and UEL.

People make a much bigger fuss about the "inefficiencies" of UEL and the "moar p0wr" performance of EL than actually exists. BOTH are a significant improvement over both stock and the Grimmspeed ported manifold with crossover pipe. Compared to those gains, the differences between EL and UEL are pretty minimal, at least according to that ~10 header dyno shootout.
Since this is built motor forum I'll add that the el/uel equality is on turbo stuff only. On n/a the el design is superior, all other things equal.
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Old 10-03-2012, 01:54 PM   #10
claythrow
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I settled on the tomei UEL, check out the website. Catless exhaust on bone stock engine with 8 lbs of boost did 255whp and 275 torque. This was all at 5k rpm we didn't even take it any higher as something didn't sound right (turned out the oil pump was failing) Tuner was impressed with the headers, said typically my car would do 230-ish.

There is only one set of tomei for single scroll and they are light weight but build quality is top notch. UP is included along with heat wrap for the whole setup.

If you are after noise though even the UEL are on the reserved side unless you get on it, or course I have an STI catback on it.

BUT IMO, P & P the existing manifolds and a GS cross pipe and ceramic coat the whole thing is not going to touch the Tomei setup. If you look at the manifolds (I can take pictures of them if you want) they just aren't made for speedy air flow.
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Old 10-03-2012, 02:18 PM   #11
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Old 10-03-2012, 02:19 PM   #12
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