90 formula with 2 1/4 inter. pipe???
Thread Starter
Junior Member
Joined: Feb 2009
Posts: 75
Likes: 0
From: Sanford Maine
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?
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
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.
Thread
Thread Starter
Forum
Replies
Last Post
