Test pipe sizing please help
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Member
Joined: Oct 2002
Posts: 382
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From: Winnipeg,MB,Can
Car: 1991 GTA
Engine: 5.7L L98
Transmission: 4L60
Axle/Gears: 3.23
Test pipe sizing please help
Looking to hack off the cats on my 91 GTA its a Dual cat car. What size of pipe should go in replace of the stock cats. 2.25 I.D pipe or is it a 2.5 I.D pipe. And what length. Tried doing a search already with no results
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From: Dallas, TX area
Car: 91 Formula WS6 (Black, T-Tops)
Engine: 383 MiniRam (529 HP, 519 TQ - DD2K)
Transmission: Built '97 T56, Pro 5.0, CF-DF
Axle/Gears: 4.11 posi Ford 9"
I believe the factory is 2.5 on my 91 Formula dual cat car....
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Joined: Sep 2000
Posts: 6,775
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From: So.west IN
Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
can this number be confirmed?
D(iameter)=C(ircumference)/Pi(3.1416).
Use a piece of string (or something flexible) & wrap it around the pipe. Take note of the length where the string overlaps (point A to B) when wrapped around the pipe. Measure between the two points & use above equation.
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iTrader: (2)
Joined: Jul 2003
Posts: 3,205
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From: Dallas, TX area
Car: 91 Formula WS6 (Black, T-Tops)
Engine: 383 MiniRam (529 HP, 519 TQ - DD2K)
Transmission: Built '97 T56, Pro 5.0, CF-DF
Axle/Gears: 4.11 posi Ford 9"
I'll confirm it for you, but may be Sunday before I can do it (got a kid graduating from college this weekend and got relatives, friends, and in-laws crawling all over the place right now......)
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