If your not planning more mods in the future then 5/8, but it you think you might do more then go with the 3/4. You don't want to end up with headers that are too small for your mods and sell then for pennies on the dollar just to rebuy the bigger headers.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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