Posted 25 November 2009 - 10:28 AM
For the EA71 in my Brat, I built my dual exhaust using 1 3/4 Primaries, an X-pipe under the trans crossmember made of 1 7/8, and I ran 1 7/8 pipe back to a pair of glasspacks, then 1 7/8 back to the back of the passenger compartment, where they do a 90 degree bend and go straight out each side. Its not loud until I REALLY get on it, but it has a ton of torque, and Ive had it up t0 over 75mph (stock 4 speed 4wd, fairly low 3rd and 4th gears) You dont want anythng bigger than 1 3/4 for the primaries on a EA71, you will lose all low-end power.
It accelerates better than my RX did, and it has plenty of torque for off-road and such.
I also am running a Weber carb, on a early 1400 manifold.