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I believe what I have right now is ~2.5" pipe to a low-restriction muffler. 2.5" is definitely not optimal, does anyone know the stock pipe size for an Integra LS/GS/DA?
Anyhow, neither attaching the vac nor restricting the exhaust to ~1/4 size seemed to do anything to my idle speed, and I'm going to need a friend if I want to test at higher rpms. One unexpected side effect was that with the vac attached, the exhaust went completely silent.
Will report back after I test.
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