obx manifold

Caraudioholic24 · Post by **Caraudioholic24** » Fri Jun 26, 2009 1:31 pm

Hey everyone. Im lookin to get an obx manifold (header)and downpipe.
I see it has the two openings for my 02 sensors but I was curious if anyone has had any lkuck with this type. I have an ATX so Im not looking for an extreme gain But they did say I will see some.
Now my question is......

Is there a way to run a CAT converter since I live in R.I. and have emissions testing......

Also I will be running a Magnaflow rear section to match my Kaminari (middle exit exhaust) will I have any issues since it has a Can and is not srtaight through.....

Lastly I had a Glasspack installed to quiet down my srt-4 rear section. Should I remove that if I decide to go with with this header.

thanks for all the help in advance

excon · Post by **excon** » Sat Jun 27, 2009 12:03 pm

if you're running the OBX long tube header, get a magnaflow high flow cat and have it welded on. It flows VERY well. Some say it flows almost like a straight pipe.

Caraudioholic24 · Post by **Caraudioholic24** » Sat Jun 27, 2009 2:49 pm

Yea its actually a reg short type. Comes with manifold and downpipe with a flex piece. I could get a high flow cat and weld it in i think. Im gonna try to get to get pics later if i can

silverneontuner · Post by **silverneontuner** » Sun Jun 28, 2009 1:38 am

doesnt the stock cat still bolt right up to the manifold?. if not just cut it and have a muff shop weld it in.

BlackRoseRacing · Post by **BlackRoseRacing** » Sun Jun 28, 2009 10:54 am

the obx short tube is similar to the stock magnum manifold so your factory downpipe and cat will bolt right up.Also note, what year is your car? Do you have the ManiVerter on your car(03-05)? Removing that may cause legal problems since that is one of your 2 converters on the car.

Post by **occasional demons** » Sun Jun 28, 2009 12:50 pm

BlackRoseRacing wrote:the obx short tube is similar to the stock magnum manifold so your factory downpipe and cat will bolt right up.Also note, what year is your car? Do you have the ManiVerter on your car(03-05)? Removing that may cause legal problems since that is one of your 2 converters on the car.

I thought some of the '00's also had the cat in the exhaust mani. Didn't know the NGC also had them. Or is it mainly the ULEV models?

ManiVerter....

...sounds like something lesbians would use.

Caraudioholic24 · Post by **Caraudioholic24** » Sun Apr 04, 2010 3:46 am

Well I installed the header today. Only problem I seem to have is the OEM cat/downpipe piece is hanging down a LOT lower than before. Also it looks like it has pushed it back as well. Anyone else run into this problem??

Im debating on running the down pipe they (OBX) sent me and weld on a Cat or just buy one of moderns direct replacement ones (downpipe flex piece and cat). Just curious for some opinions. Thanks

dblsg · Post by **dblsg** » Sun Apr 04, 2010 4:47 am

Caraudioholic24 wrote: Im debating on running the down pipe they (OBX) sent me and weld on a Cat or just buy one of moderns direct replacement ones (downpipe flex piece and cat). Just curious for some opinions. Thanks

this would probably be your best option. things will fit better that way.

neonslg09 · Post by **neonslg09** » Sun Apr 04, 2010 8:54 am

Do you REALLY need the cat? Just delete it and throw on the DP.

Forest Green 2k · Post by **Forest Green 2k** » Mon Apr 05, 2010 11:29 am

Hooking up the stock cat/dp to the OBX header will lower it and push it back slightly, nothing too crazy or dangerous though, just normal.

Caraudioholic24 · Post by **Caraudioholic24** » Mon Apr 05, 2010 12:55 pm

neonslg09 wrote:Do you REALLY need the cat? Just delete it and throw on the DP.

Yea I was debating on not running a cat but the emissions testing here in RI sux. So I didnt want to deal with it.

Forest Green 2k wrote:Hooking up the stock cat/dp to the OBX header will lower it and push it back slightly, nothing too crazy or dangerous though, just normal.

I didnt mind that it was pushing it back it seems that is is about 4 inches lower now as well. Thats what Im worried about. Did you have that problem??? I had a glass pack welded right behind the slip-joint where the downpipe and mid section meet. That could be an issue if I have to cut it and push it back.

Post by **occasional demons** » Mon Apr 05, 2010 1:02 pm

Is it a mid length VS a shorty? 4" is a lot. From what I can tell from pics, the shorty looks damn close to a Magnum header, which is the same dimensions as the cast manifold.

A problem I had after putting a glasspack in the midsection was the flex joint between the cat and the glasspack would let the midpipe sag. I ended up removing that flex joint, and let the one at the manifold do all the flex duties.

Caraudioholic24 · Post by **Caraudioholic24** » Mon Apr 05, 2010 1:07 pm

It seems the only flex piece that I have is an enclosed donut type and its mounted right behind the header flange. It was late but I will try and get some pics up.

Its the OBX shorty i assume. It did come with a cat delete downpipe. I might just put them side by side to see if there is any difference in length.

Forest Green 2k · Post by **Forest Green 2k** » Mon Apr 05, 2010 9:23 pm

I bought this OBX shorty header locally last year:

Click Me

But it was used and didn't come with the downpipe so for up until last week I had it was bolted up to the stock cat/dp and it def wasn't 4 inches lower. Last week I installed a decent stainless steel "test pipe" from ebay and again, no clearance issues.

Caraudioholic24 · Post by **Caraudioholic24** » Tue Apr 06, 2010 8:41 am

ok well I pulled off the oem downpipe/cat and compared it to the obx and of course there is a huge difference. Its like 4 inches shorter and the bend is much much higher. Not sure if they redesigned it in 05 but I bolted up the obx downpipe and of course it fit like a glove. Here are a couple of pics....

So I guess my options are to buy a high flow cat and have another bung welded on after the cat. Modern wants 110 for theirs. I found a flowmaster for like $40 bux and is only 2 inches longer. I may shoot for this one.

Click Me

I should have the 2.25" piping right???? The crappy part is getting all of this welded together without messing up the angles and crap. Should be a good time. LOL.

dblsg · Post by **dblsg** » Tue Apr 06, 2010 10:35 am

that flex pipe is pretty much junk. mine rusted in about a year... i ended up cutting a piece of the end of the stock cat pipe in order to get it to fit better.

besides, if you just use the obx dp, your gonna throw a CEL.

Caraudioholic24 · Post by **Caraudioholic24** » Tue Apr 06, 2010 10:41 am

yea I figured that. Thats why Im hoping to get some answers on here.

Even if I modify the stock cat it still wont sit high enough in the exhaust channel. The fins of the cat will bounce off the underside of the car. There lies my dilema!!

I see MPX has a replacement downpipe w/ flex and cat but says it wont fit magnum motors??? Not sure if the diameters were different or not. GRRR! this kind of sux right now.

By the way how the heck are you. I havent heard from you in a while!!!

Forest Green 2k · Post by **Forest Green 2k** » Tue Apr 06, 2010 11:10 am

My stock cat got clogged after installing my header without a downpipe to compliment it.

Post by **occasional demons** » Tue Apr 06, 2010 11:13 am

If it is for a 2gn, it will fit, there is no difference as that goes between the R/T, and SXT. The thing with the Magnum down pipe is that it has no o2 bung in the header, so it needs one in the down pipe.

By the way how the heck are you. I havent heard from you in a while!!!

Having two sausages keeps one busy.

Caraudioholic24 · Post by **Caraudioholic24** » Tue Apr 06, 2010 11:41 am

LOL the mpx one does have the bung welded after the cat which is what I need.

http://www.modernperformance.com/replac ... -1392.html

if anyone has bought one I could really use some measurements!!!

Forest Green 2k · Post by **Forest Green 2k** » Tue Apr 06, 2010 12:14 pm

I'm actually kinda glad I bought my header used without the DP cuz the ebay one I have now has a bung on each side if I ever decide to get a high-flow welded on.

Post by **occasional demons** » Tue Apr 06, 2010 12:22 pm

Caraudioholic24 wrote:LOL the mpx one does have the bung welded after the cat which is what I need!

I was referring to the one before the cat. Meow.

dblsg · Post by **dblsg** » Tue Apr 06, 2010 2:02 pm

occasional demons wrote:If it is for a 2gn, it will fit, there is no difference as that goes between the R/T, and SXT. The thing with the Magnum down pipe is that it has no o2 bung in the header, so it needs one in the down pipe.

By the way how the heck are you. I havent heard from you in a while!!!
Having two sausages keeps one busy.

been good, extremely busy... thanks for asking.

but i think your best bet is to have a cat welded on to the obx pipe.

jckevns · Post by **jckevns** » Tue Apr 06, 2010 3:51 pm

when i was running the obx header, i had a magnaflow replacement cat on there

it bolted right up to the obx header and had a bung for an o2 sensor

i wasn't using the stock exhuast though

Caraudioholic24 · Post by **Caraudioholic24** » Tue Apr 06, 2010 4:31 pm

ok yea i figured i would be beteter off using the obx downpipe. now will that flowmaster cat i linked above be good. i mean its a great price considering modern want 110 for theirs. the flowmaster is 2 inches longer.only problem is getting it tig welded is gonna cost me. still debating on just getting the premade one from modern just because of the price. i may have a buyer for my obx one. we shall see what happens.

Forest Green 2k · Post by **Forest Green 2k** » Tue Apr 06, 2010 7:37 pm

Caraudioholic24 wrote:still debating on just getting the premade one from modern just because of the price.

That one from modern is over-priced IMO.

Caraudioholic24 · Post by **Caraudioholic24** » Tue Apr 06, 2010 8:50 pm

yea u aint kiddin. i may bite the bullet and grab that high flow cat off of ebay and get it welded on. lookin on ebay now for a downpipe thats similar but with more room for a the cat in case someone finds one.

Post by **occasional demons** » Tue Apr 06, 2010 9:00 pm

That is about the average price. Summit is $201.00, but then there is Shipping/handling....

I have that piece, but I m not impressed with the blend in on the flange. It is just a 2.25 hole in the plate. There is a nice 3/4" lip around the outside where the manifold/header flange bots on. The oem is more of a gradual step down from 3" to 2.25".

Edit:

Caraudioholic24 · Post by **Caraudioholic24** » Tue Apr 06, 2010 9:42 pm

ooo do u have any above shot pics. i need to make sure its similar in size to my obx one. mainly the bend. length can be fixed lol. maybe a measurement.if its the same exact thing as my oem one im stuck at square one.

i was thinking that after buying a cat getting it all tig welded and crap that moderns was about the same price. so it all depends on the size.

Caraudioholic24 · Post by **Caraudioholic24** » Tue Apr 06, 2010 9:55 pm

hmmm curious if the changed the dsesign of them on moderns website it looks a little different. the only thing that may hurt me is the bend. mine seems to need to be up a few inches to be perfect but i think i could fix that. thanks again