Oh yea, i have a 1985 delta 88 royal and im getting duals put on with an offroad X-pipe finally next wednesday. Call it a birthday present to myself

Also, what is the sensor hooked up to the catalytic converter? O2 sensor?

Sweet... Dual exhaust always looks great... Sounds great too! Get some pics up when you get it done!!!

I am not familiar with any sort of sensor on the exhaust system of a carburated vehicle??!?! It wouldnt need to know how much oxygen is in the exhaust, unless you have TBI?

Hi c_creations, 88delta88, hello all,

Good to see you're doing something that will increase your power/mileage.


In your case an H pipe would be easier, less expensive, and work just as well as an X pipe.

What is an off road X pipe?


Or a computer controlled Q-Jet.

Regards, Norm

I will, well the guy said that you get better flow with an X pipe because it crosses, H just equals the pressure in each of the pipes he was like the x pipe has kinda the same effect a 40 series flowmaster has nice quiet when idleing, but really gets mean when its romped on.

sweet, dual exahust always looks nice on a delta. Be sure to post some pics when you get it done!

Hi c_creations, all,

So what is an off road X pipe?


With a high performance engine, yes. With your combo you'll never see enough RPM for the X to work as well as the H pipe.

Were ground clearance issues discussed?


Not exactly, since the pressure is never equal at both ends of the crosspipe, it smooths the sound, stabilizes the idle, lessens back pressure and makes more power where you need it.


H pipes on my chevies do the same.

If you're only interested in sound, a flowmaster on your existing single exhaust would be much less expensive and achieve the same results.

If your interested in looks, then hang an exhaust tip under the opposite side of your exhaust.

Regards, Norm

I knew a guy who did that... He just made a bracket and welded a tip on the end. It looked REALLY good! It didnt function, and in the winter time it would look funny with exhaust gas rising from only one side, but it did make the car look good!

would it be better just to get true duals then?

Hi c_creations, all


Dual Duals?


It's been done for many years. and more often than you would expect.

A single exhaust with a Y into two exits is for appearance only, it cannot make more power and cannot be considered a two pipe system.

One other way to go, might be to use one 2 1/2" mandrel bent pipe (without a cat) from the Y to a low restriction muffler at the rear bumper.

Dual exhausts are always helped by using an H pipe.

When you get to the point of changing to a bigger, high performance, engine, you'll need to redesign the system and the X pipe might be one of the needed changes.

Bottom line: If you're looking for the maximum power improvement in your combo, use dual exhausts with an H pipe.

Regards, Norm

well my car is big body, and has plenty of room, and theres no way id get a y pipe unless it was like a cat back high performance one, saw one on a trans am and it was really cool, sounded awsome. but i want dual exahst, and i want to know if an X pipe would be all that worth it, or would H be just as good. it really doesnt matter and no there wont be a cat on it. no way. ive heard X makes it more consistant and is louder than true duals is this true?

Hi all


I miss spoke: "just as well" should have been "far better".



You can keep asking but the answer is not going to change.

Regards Norm

I'm going to put it as simply as I can this time.

USE THE H-PIPE BECAUSE, FOR YOU, IT WILL WORK BETTER THAN THE X-PIPE


Always consider who is talking, what is their agenda, and do they actually know what they are talking about or are they passing along some BS they heard. Then if you believe them, do it.


More consistent? Please explain.


Not true. You change the sound by using different mufflers. Mufflers are a different subject and a discussion can be started in a new thread.

Regards Norm

PS. USE THE H-PIPE BECAUSE, FOR YOU, IT IS THE BETTER CHOICE.

I agree with Norm.... yes, an X pipe may be better in some applications but for your 307 you're better off with an H pipe.

Remember you CAN have too little exhaust restriction, if your exhaust is too big, not properly matched to your engine you can loose low end torque.

would it be ok to have just a dual exahust setup? that would be cheapest. and would be easiest. best sound, less performance. i mean it is a 307 wooooohooooo.

Yes. Just add the H pipe to make it run and sound right.