Hey guys, I'm wanting to do some exhaust work to my 92 Firebird with 305 TBI... I saw these headers recommended several times... It says 86-90... Any idea what is different about a 92?

 

Pretty sure what they're getting at is they're a bolt on for 86-90 cars with a 3" single cat. 91-92 HO cars had dual cats. Doesn't really apply to TBI, all the low output applications in 91-92 had smaller diameter exhaust into a single cat, hence there's no applications in the last few years that they'd be a bolt in.