Bow Tie Power

When I bought my Firebird Formula, I was told it has a Flowmaster 40 series. I looked under it and noticed it does have Flowmasters, but is it a catback? Also, How can you tell if your cat is a high flow cat or not? I showed a few friends mine and they all said it's some sort of aftermarket cat.

Bow Tie Power

This is very similar to what mine looks like but it isn't polished like this and it doesn't have a name on it.

Catmaigne

iTrader: (6)

Take a caliper and measure the diameter of your pipes. I think stock was 2.5" to the muffler and 2.25" tailpipes. I think Flowmaster made a catback that had stock sized pipes, you would be able to tell if there are slip fit joints and clamps. I would rip it out in favor of a real 3" system.

The stock cats don't have thin heat shields like that, they're pretty plain. I think I mine had the letters "AG" on the case.

bufmatmuslepants

iTrader: (3)

It's probably just a 90 series catback or just a 90 series muffler in the stock location, which flows the same as stock.

shbox

A stock intermediate pipe is 2.75".