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Guest Message by DevFuse

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Exhaust for EA-81

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2 replies to this topic

#1 JWX


    Lonely driver

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Posted 04 September 2004 - 01:47 PM

I'm planing out mods on my hatch and I can't decide upon the size of the exhaust. is 2 inch from the heads to an Hpipe then 2 1/4 to a glass pack too big? engine will have atleast a weber and a coil, and maybe a cam and head work.

#2 TomRhere


    Certified BRAT nut!!!

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Posted 06 September 2004 - 05:53 AM

From what I've read here, and on other Subaru boards, 1-7/8" on the lead pipes is about as big as you'd want, then go either 2", or 2-1/4" the rest of the way. But this was for a basically "stock" engine setup. If you're going to port/polish the heads, and do a bigger cam, you may want to go with 2" pipes off of the heads. Try to keep the lead pipes equal in length as you do this, it helps to balance the flow.
On another note; I built my own 2" true dual system under my '82 BRAT. It had an EA-82 engine in it, running the Hatachi carb at the time, and bone stock otherwise. I did swap a Weber onto it later, plus the Accel coil. I didn't really notice a loss of low-end torque, and she really liked to cruise on down the hiway, with the 2" pipes, even with the Hitachi on it. This was from the heads on back.

#3 Jibs


    Wonder Triplets Activate

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Posted 06 September 2004 - 10:25 AM

What should I use if I want to make a 4x4 Brat? I want the most torque and HP I can, so what's best? Thanks

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