anyone have a pic of the exhaust flanges? need to see the difference... thanks :]

At the heads themselves the y-pipe or crossover pipe mount is exactly the same.

 

From front to mid and mid to rear the same type of flanges but routing is different so the sections aren't compatible past the y-pipe or front section back.

so a true dual exhaust from an ea82 will bolt right on to an ea81 engine?

i have an ea-82 y- pipe on my 86 brat,stole a flange from a donor car, had it welded to a thrush glasspack that duals out in the back.it is all about the routing.but the y-pipe will bolt right up.or the two "header pipes"will bolt right up if it is truly dual exhaust.just a hint, use the better of the two exhaust manifold gaskets you can get your hands on.they are thick and silver.you will know them when you see them.

The Subaru stock manifold gaskets on mine are dark brown and waxy (or maybe that is a coating?). I don't know the reason for the difference.

although that dual exhaust is off an ea82, it came out oif an ea81 BRAT. so it will fit compared to the body the same

 

the only real difference is how low the pipe comes to clear the crossmember. example is that if you use an ea81 pipe on an ea82 car it wont clear the front crossmember. this is because of the cast iron egr ports on the ea81. you can take these off the ea81 and an ea82 pipe will be required to fit around the crossmember

 

now with the egr ports there your exhaust may hang a little low? the egr ports have recessed bolts that hold it to the head, opposite holes. but if you take it off the other holes are there to use.

He has the system I built for the '82 BRAT when the EA-82 engine was in it.

 

Seeing as how you'll need to shorten the pipes down to fit under the Hatch, cut the pipes ahead of the mufflers, (instead of behind them like we talked about). Now, you'll be able to bolt the pipes to either exhaust port to match the engine flange bolt pattern, won't need to remove the cast-iron blocks that way, (unless you want to), then re-attach mufflers. Leaving the blocks in, may give you enough clearence for the sway-bar to remain on the Hatch, but I can't say for sure on that.

 

You'll be good to go.............................

Just my 2 cents but I wouldnt recomend 'true dual' exhuast on an EA81 or EA82. All you will get is excesive noise and a loss of low end torque. I've tried several true dual exhuast systems on my EA82, a custom Y pipe and now an EA81 y pipe. Y pipes are best on these engines due to the fireing order and the promotion of scavanging effect. True duals will not scavange due to the large gap in exhuast pulses from the way these engines fire. The best dual exhuast system on these, IMHO, would be a Y pipe and splitting to duals after the Y pipe. This will give you the superior function of the Y pipe and the 'cool factor' of dual exhuast

well, I went with the true duals because Tom is an extremely generous man and made me a GREAT deal on it. My car had a severely rusted Y pipe on it and NOTHING else. My original plan was to run a single exhaust with a glass pack off the Y pipe until I got under there and saw how bad the Y pipe actually is. So on my budget, this was by far the best option

well, I went with the true duals because Tom is an extremely generous man and made me a GREAT deal on it. My car had a severely rusted Y pipe on it and NOTHING else. My original plan was to run a single exhaust with a glass pack off the Y pipe until I got under there and saw how bad the Y pipe actually is. So on my budget, this was by far the best option

I know exactly what you mean; I was in the same boat. Thats why I went to true duals. Simple to make and cheap on materials. Y pipes are super rare in MN becuase the EPA will not allow the resale of a used catalytic converter so junkyards cut them out and scrap them.

 

I would still highly recomend a custom or OEM Y pipe. They are not that hard to make now that I've done one. There are several ways of doing it also. I guess if you are dead set on the duals; bolt them on and find out what I'm talking about

 

Might not be a good comparison as a rotted out Y pipe and exhuast system is going to be just as bad as true duals. After I bolted on my custom Y pipe and felt the first pull in 1st gear I knew what I was missing.

 

Do what you will

how about an H pipe? since I already have this exhaust system, and it was cheap, how about a pipe connecting the two duals up underneath the engine? would that have the same effect as a Y pipe?

If I have to actually go to a custom Y pipe for performance sake, then I'm going to run single exhaust off of that