HP gain with long tube headers?
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Old February 13th, 2009, 12:45 PM   1 links from elsewhere to this Post. Click to view. #1
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HP gain with long tube headers?


I have a 2004 Mustang GT with 5-speed. Mods include 3.73s, BBK CAI, 70mm throttle body, BBK upper plenum, Comp 262AH cams, SLP x-pipe with cats, Flowmasters, dyno-tuned.

Currently making 299rwtq at 4200 rpm and 265rwhp at 4900 rpm.

How much of a gain will I see by installing the SLP long-tube headers with this setup? The SLPs mid-pipe is modular making it possible to add the long tubes without tossing the mid-pipe.
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Old February 13th, 2009, 12:47 PM   #2
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I'm not familiar with a modular setup. You will see somewhere between 5-10rwhp with longtubes and even more if you get a O/R midpipe.
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Old February 13th, 2009, 12:51 PM   #3
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The SLP mid-pipe comes with part of the pipe that can be taken out, so that the catted-section can be mated to the long-tubes.
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Old February 13th, 2009, 12:51 PM   #4
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Remember, I have cams so I thought that the engine could better take advantage of the long tubes?
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Old February 13th, 2009, 12:54 PM   #5
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It might make a little more power than a non-cammed engine but you're not going to get a 20rwhp gain or anything like that. I'd think right around 10rwhp would be about right.
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Old February 13th, 2009, 12:56 PM   #6
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But if you had a blower...
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Old February 13th, 2009, 12:57 PM   #7
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I'm not going to spend over $1000 to pick up 5 or 10rwhp!
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Old February 13th, 2009, 01:00 PM   #8
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If you plan on going FI it's worth it. SLP is nice and expensive. Check out MAC or BBK. I've had BBK before and it worked just fine. I'm going MAC this time around.
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Old February 13th, 2009, 01:00 PM   #9
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If you had a blower that changes everything. Blowers get more power with the more mods you have.
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Old February 13th, 2009, 01:20 PM   #10
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Long-tubes do not add a lot of horsepower according to before and after dyno runs. And, most of the gains that are seen are most likely the result of the off-road mid-pipe. Its the one mod that I've done where I think the money would have been better spent elsewhere.
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Old February 13th, 2009, 01:29 PM   #11
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Originally Posted by Eagle2000GT View Post
Long-tubes do not add a lot of horsepower according to before and after dyno runs. And, most of the gains that are seen are most likely the result of the off-road mid-pipe. Its the one mod that I've done where I think the money would have been better spent elsewhere.
if you are n/a. I think they help alot out with airflow if you are blown with a good midpipe and all.
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Old February 13th, 2009, 01:42 PM   #12
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Originally Posted by Black Bullitt View Post
But if you had a blower...
Originally Posted by saxmanJJ View Post
I'm not going to spend over $1000 to pick up 5 or 10rwhp!
Originally Posted by Black Bullitt View Post
If you plan on going FI it's worth it. SLP is nice and expensive. Check out MAC or BBK. I've had BBK before and it worked just fine. I'm going MAC this time around.
Headers dont really give gains, 10 maybe 20 hp if your lucky. The added pressure forces the air out of the stock manifold and it being so short, about 14 inches for the longest run the negative affects are minimal. Add in the fact that they can be a real hassle for work lata on and they arent worth it to me.
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Old February 13th, 2009, 01:49 PM   #13
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IMO you only feel LT more at the top end and gain HP up there. Doesn't help w/ Low end at all...
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Old February 13th, 2009, 01:55 PM   #14
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This might very well be my uneducated opinion but, does 265rwhp on a cammed engine seem low to anyone else?
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Old February 13th, 2009, 02:00 PM   #15
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I agree 03sonic, with just cai, udps, off road x and flowmasters I was at 256rwhp and 299 rwtq. I would think that cams and his mods would be more than that.
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Old February 13th, 2009, 02:02 PM   #16
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my bassani has the modular legs for it... id bet you'll see 10-15 rwhp..thats not outa the question at all...
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Old February 13th, 2009, 02:07 PM   #17
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LT's really woke my kb stang up. Don't have before and after numbers though, since i have been doing tunes with tricktuners.
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Old February 13th, 2009, 02:23 PM   #18
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Originally Posted by 03SonicBoom View Post
This might very well be my uneducated opinion but, does 265rwhp on a cammed engine seem low to anyone else?
He's losing some power not having an O/R midpipe. But cams on our cars don't do as much as what they do for the pushrods.
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Old February 13th, 2009, 02:26 PM   #19
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On a stock bottom end where you can't push more boost I'm sure the gains will be minimal on a blown application, but with a built block and LTs with lots of boost you'd come out on top.
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Old February 13th, 2009, 02:32 PM   #20
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Originally Posted by saxmanJJ View Post
I'm not going to spend over $1000 to pick up 5 or 10rwhp!
man, who's selling you those longtubes, are they made out of gold or something? i picked mine up for $200!
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