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90 formula with 2 1/4 inter. pipe???

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Old 02-16-2009, 08:18 PM
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Car: 1990 firebird formula
Engine: 5.0 tpi
Transmission: t-5
90 formula with 2 1/4 inter. pipe???
went under and messured my pipe at the muffler and its only 2 1/4 OD.is this factory or was it changed to a v6 one or something?
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Old 02-17-2009, 12:02 AM
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Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: 90 formula with 2 1/4 inter. pipe???
Yes that's factory for the single cat TPI cars in '89-'92, its the same as the TBI engines, not V6. The dual cat TPI cars got the bigger exhaust.
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