Exhaust?

My64 Mustang289 · 05-13-2008, 10:54 AM

Ok I am having a local exhaust shop put on my exhaust. It is all custom made duels and all but i was wondering if i should get H pipe X pipe or just straight back duels. And how much different would the 3 make preformance wise. Also headers... Should i get new ones on it because all i have is the original 289 headers from 1964 hahah. And what headers would be the most cost efficent and sound great and get good horse power.

kalli · 05-13-2008, 11:01 AM

Hiya. I know this is not what you want to here:
when you put in dual exhausts, you might have to re-route the rear brake line as this will be close to the 2nd pipe when you don't have factory dual.
Especially since you have a 64 model as well (which only have a single brake circuit).
Just as a safety advise ...

I have 2 seperate pipes, no crossing. Love it. But I would love to hear what's better on H/X pipes as well

Kalli

true66gt · 05-13-2008, 11:10 AM

no need for an x or h pipe.

no such thing as original headers. theyre exhaust manifolds.

get some patriot tri y headers. or some hedman longtubes or hookers. either of the three are fine. theyre about $150 each for black painted ones. but the paint burns off anf youre left with bare metal headers which will rust. so if you willing to spend the money, get the ceramic coated version of either of them.

crey · 05-13-2008, 12:40 PM

I'm not sure exactly what connecting both exhaust sides via the H-pipe or X-pipe really does, but I have been advised from more than one source that it's important. I've also been told that unless I go with a bigger carb and better intake thanthe stock2 barrel and original intake on my 289, I'm best off just putting a dual exhaust on my original manifolds.

I ordered my dual exhaust out of the catalog and found the tailpipes difficult to fit in. If I wasn't so intent on doing everything myself, I would have had a muffler shop do the work for me.

I didn't have any clearance problems myself between the rear brake hose and the drive side exhaust pipe, but it is something I'm glad I checked.

AV8ForFun · 05-13-2008, 12:52 PM

An engine doesn't exhaust from the cylinders in an alternating pattern. (ie. Left side, right side, left side back and forth etc.). Instead it mayexhauston two sides on consecutivecycles(ie. Left side, right side, right side, left side, left side), this will cause the exhaust pressures to not be balanced from cylinder to cylinder. (each cylinder doesn'thave thesame backpressure on the exhaust). By having the x/h pipes you effectively increase the diameter of the exhaust system as the gasses are split in two and the imbalance is not as noticeable.

IMO, it is only important to have an x/h pipe if you are tweaking it for every ounce of HP you can get, which most of us would like to think we are doing.

Personally, I like the sound of true duals much better than the sound of an X/H pipe, but I will probably get an x/h pipe when I do my exhaust.

urban_cowboy · 05-13-2008, 01:59 PM

Hooker super comp long tube headers tuck up nice on my '69. As for h pipe or x pipe, I think they are a band-aid for exhaust that is too restrictive. Just make sure they put in good/appropritate size pipe, mandrel bends, and low restriction muffler.

KBunny · 05-13-2008, 02:58 PM

If you are like any of us here you will be doing more to your car in the future (Intake, Carb, Ignition, etc.) so I would get a nice set of headers now before you get the custom fit exhaust so that you don't have to worry about trying to make new headers fit where your old manifolds were latter down the road.

I have herd that the X pipe gets the most power increase, the H pipe gets the a little less, and straight out duels get the least. Though the power difference between the best (x pipe) and the worst (no cross over) is minimal, we are talking about 5hp tops.

DISCLAIMER!!!!: I have never delt with either X or H pipes so I am only speaking out of what I have herd others tell me.

kalli · 05-13-2008, 03:45 PM

Quote:

ORIGINAL: urban_cowboy
they are a band-aid for exhaust that is too restrictive.

LOL

i run true dual as well. as for exhaust only if carb and intake are done. I believe that's wrong.
I have a stock 289 2barrell with lonhg tube headers and flowmaster 40s. And if that doesn't already pull 20hp out of the stock engine, then at least it sounds like 50 ... :-]

i don't know on how accurate desktop dynos are. in theory quite good probably. but if you put in a stock 289 you end up with 190HP. add long tube headers with mufflers and you get 220. difference is 30. If only half of that is true then your mate is wrong ;-)

true66gt · 05-13-2008, 04:35 PM

like i said before. no need for an x or h pipe on a carbed 289/302. plus, im not sure how much room there is to actually fit one.

its a huge benefit with the modular FI motors though.

there maybe be more HP on paper but in reality, it doesnt make or break the quickness of the car. in other words, you cant feel the difference in the pedal. dont bother with the extra money and/or labor charges.

66JameStang · 05-13-2008, 04:54 PM

Well from what I know, The X-pipe is supposed to supply a more efficient flow of exhaust, which in turn can help your power even if it is slight. I am not an exhaust expert but that is what my understanding is. I always thought no cross over was best but that seems not to be the case. It is the same effect as having the right size pipes, if they are too big it can effect your power. Like I said I am no exhaust expert but that is my understanding.

Oh X-pipes are supposed to be better then H-pipes, it has to do with the flow, I found this out after I but H-pipes on my car.