sam o nela

Super thanks to Brent (Beeze) for providing me with these headers pics!

Okay guys so here's some comparo pics between the Stock Exhaust Manifold and B-Pipe vs. the OBX Headers setup...

Full Setup:




Rear Manifold:




Front Manifold:







EGR Mount:




Flex Pipe:




"Y" Pipe:







O2 Sensor Bungs:





Rear Flange (Cat Mount):




Measurements

Flange thickness on OBX Headers: 3/8"

Manifold Inlet Diameter:
Stock = 1.25" x 1.75"
OBX = 1.25" x 1.75"

Inside Pipe Diameter, Rear Flange:
Stock = 2"
OBX = 2.5"

Overall Length (Front bend to rear cat flange):
Stock = 40"
OBX = 42"

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<Monocolor Paint Scheme> <JDM Clear Corners> <Cleared out Rear Turn Signals>
<Acura Caliper Grill Emblem> <Independent Yellow Fog Mod> <15% Tint>
<Iggee Seat Covers> <EL Reverse Glow Gauges> <Dimmer Mod>
<Ford Taurus Cupholder Mod> <CC Tunk Light Mod> <Fut Short Throw Shifter>
<Custom CAI> <AEM Bypass Valve> <OBX Headers>
<Magnaflow High Flow Cat> <Dynomax Super Turbo Muffler>
<Drilled/Slotted Rotors> <Painted Calipers> <Axxis Metal Master Pads>

 

paulo57509

I thought there would be dyno numbers.

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'87 L-Coupe 5-Speed
Stock; NO Mods
394K Miles - original engine and drivetrain.

kitchwatembo

diggin the leather couches and the flanel pants lol

true playa, just like me

__________________
My 87 Legend L 2.5 V6
-Prelude wheel- -EL reverse gauges- -reinforced hood struts- -halogen headlights- -Cold Cathode trunk lights- Dual HU- -Infiniti components up front- -Pyramid component rear- -12" Pioneer in bandpass box- -Acura caliper grille emblem-

sam o nela

oops...didnt mean to mislead...I'll adjust the thread title...

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<Monocolor Paint Scheme> <JDM Clear Corners> <Cleared out Rear Turn Signals>
<Acura Caliper Grill Emblem> <Independent Yellow Fog Mod> <15% Tint>
<Iggee Seat Covers> <EL Reverse Glow Gauges> <Dimmer Mod>
<Ford Taurus Cupholder Mod> <CC Tunk Light Mod> <Fut Short Throw Shifter>
<Custom CAI> <AEM Bypass Valve> <OBX Headers>
<Magnaflow High Flow Cat> <Dynomax Super Turbo Muffler>
<Drilled/Slotted Rotors> <Painted Calipers> <Axxis Metal Master Pads>

Beeze

Thats just how I rep the streets yo, I keeps it real...lol

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Beeze

my measurement was rough so the 42" might be more like 40"...we should both bring our headers to the meet on the 15th and do a real life comparo.

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tubadude

nice guys. if i get the extra time, i may order a set (flange size was worring me)


Brent, when do you plan on getting yours installed?

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Tubabusting is no more read here to find out more

l4zy415

hmm the way i see it, the holes on the oem headers looks a bit wider then the obx headers. or im i just blind because its made out of stainless steel? damnit i want one now lol.

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______________________________
18" Limited 341 Chrome Rims/\Matador Red Paint/\Weapon R - Secret Weapon Intake/\LED Bright White Dash Lights/Floor/\Kenwood KDC-X590 Excelon Mp3 Deck/\Ford Taurus Coin/Cup Holder/\2 12" Kickers/\1200 Watt Sony XM-2200GTX 2-Channel Xplod Amp/\2 Rockford Fosgate Capacitors/\Power Acoustic Capacitor/\Clear Rear Turn Signal/\Reverse Glow Gauges/\Swapped 88' Headlights to 89'-90'/\JDM Rear Chrome Trim/\Stromung Muffler/
Soon To Come: Rebuild Motor and 5-MT Swap

Beeze

Most likely after my deployment because I will have the funds to do the 5 spd swap then I willl install the headers...Do not wat to deal with loud drone of an auto w/ headers and full exhaust, ya know?...

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Alperovich

wow, those numbers are so close to stock. and we are comparing from the 2.5L exhaust right? which i thought was the same as the others? just wanted to clear it up.

you guys really need to do a before obx dyno, and a after obx dyno then also maybe a obx with a highflow cat dyno. this will really show what kind of numbers we can expect from these crap toys (obx's)....

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~Alex

94 GS
MLS Bar; FUT rear ties; ADDCO rear sway bar; Blackend Engine Damper; EBC Yellow pads; D/S Rotors; Enkei EVO5's
Alpine HU+Speakers; 93 front bumper; Matte Black grill; Stromung axle-back 2.5 tips

sam o nela

Yeah No problem....I'll bring em to the meet!

Alex, as far as the differences between 2.5 and 2.7, the rear manifold is a different part number, but the bolt pattern is exactly the same...the differences (whatever they may be) may be slight...but will not affect headers installation.

Also, the stock manifolds (as is usually the case) all flow into on large cast-iron chamber/cavity and then dump into the 2" b pipe. After that, they hit the y pipe (pretty much an "h" shaped piece that connects the front and rear manifolds) and then flow to the cat through a 2" pipe.

The OBX's start by flowing through a 3-1 tubes. However, the front bank hits the B-pipe while the rear bank is ONE PIECE with the B-pipe (but the are also 3-1). The entire assembly then flows into a 2-1 collector before the flex pipe and flows to the cat through a 2.5" pipe...

SO on paper and in pictures, this setup just screams better flow...but we are going to need numbers....

Like Alex said, we would need a baseline with somebody with stock exhaust, and then (preferrably) an install with just headers (which appears to be possible from my and Brent's measurements) and then (if they'd like) a third dyno run with Headers and a full exhaust....

Maybe we should start a little G1 fund to help with the cost of this if someone is willing to be the guinea pig?

I have a couple strikes against me because:

1) I have a 2.5 while the majority on here have 2.7s
2) I didnt dyno before full exhaust install...
3) My 2.5 is old and tired and would possibly churn out lower numbers anyhow

We'll figure this one out guys...stay tuned...

__________________


<Monocolor Paint Scheme> <JDM Clear Corners> <Cleared out Rear Turn Signals>
<Acura Caliper Grill Emblem> <Independent Yellow Fog Mod> <15% Tint>
<Iggee Seat Covers> <EL Reverse Glow Gauges> <Dimmer Mod>
<Ford Taurus Cupholder Mod> <CC Tunk Light Mod> <Fut Short Throw Shifter>
<Custom CAI> <AEM Bypass Valve> <OBX Headers>
<Magnaflow High Flow Cat> <Dynomax Super Turbo Muffler>
<Drilled/Slotted Rotors> <Painted Calipers> <Axxis Metal Master Pads>

tubadude

I was going to do the dyno day that aaron tried to set up, but that obviously failed. however, my exaust isnt exactly stock, my muffler is there, just no pipe to it

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Tubabusting is no more read here to find out more

Muffo

Would you be able to provide measurements between bold holes please

Xcaliber003

Nicely done!! The difference is BIG!!

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"love em all,trust a few,and fear none". . .Mos Def


"Don't look at your car as it is now, see it the way it'll be when you're done fixin it up."

"ridin down the block like what else should a brotha do."

sam o nela

Just a Bumpdate:

Here are the pics of the two assemblies side by side courtesy of your friendly SoCal Crew









As you can see, there is in fact a 2" difference in length between the two pipes...if one did wish to install only headers and retain the stock cat and piping...it is indeed possible...

__________________


<Monocolor Paint Scheme> <JDM Clear Corners> <Cleared out Rear Turn Signals>
<Acura Caliper Grill Emblem> <Independent Yellow Fog Mod> <15% Tint>
<Iggee Seat Covers> <EL Reverse Glow Gauges> <Dimmer Mod>
<Ford Taurus Cupholder Mod> <CC Tunk Light Mod> <Fut Short Throw Shifter>
<Custom CAI> <AEM Bypass Valve> <OBX Headers>
<Magnaflow High Flow Cat> <Dynomax Super Turbo Muffler>
<Drilled/Slotted Rotors> <Painted Calipers> <Axxis Metal Master Pads>