Exhaust pipe diameter...dual Vs. single

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Apr 4, 2002 | 07:53 PM

'91 Formula

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From: Lk. Ronkonkoma, Long Island N.Y., U.S.A.

Car: 1991 Firebird Formula

Engine: 383 Supercharged and Intercooled

Transmission: 6-Speed

Axle/Gears: Stock 10 bolt 3.42

Exhaust pipe diameter...dual Vs. single

Does anybody know with a dual exhaust, what pipe diameter would equal a single exhaust. Say I have 3" exhaust. What would a dual equivalent be? Or 4", what would a dual be.

Apr 4, 2002 | 11:45 PM

Mark A Shields

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From: Someone owes me 10,000 posts

Car: 99 Formula

Engine: LS1

Transmission: T56

Axle/Gears: 342

Dual 2.25" would be equal to 3" piping.
As far as 4" I would guess 2.5" duals.

Apr 5, 2002 | 12:50 AM

iceman02

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From: waco, tx

Car: 91Z28 L98

Engine: HSR 350

Transmission: Goebel 700R4

Someone on this board had a link to their webpage that had a chart comparing the two, just what you are looking for. Too bad I don't remember who it was or where it was.....maybe they'll come along sooner or later.