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**DirtyD** · 07-19-2013, 04:25 PM

Cat back systems replace all components of the exhaust system from the catalytic converters to the exhaust tips. Axle backs are from the axle back, which is the same thing as mufflers only.

And for the record, full exhaust is from the headers/manifolds back.

**2012mustang76123** · 07-19-2013, 04:37 PM

Originally Posted by DirtyD

Cat back systems replace all components of the exhaust system from the catalytic converters to the exhaust tips. Axle backs are from the axle back, which is the same thing as mufflers only.

And for the record, full exhaust is from the headers/manifolds back.

so would the cat back system not let you pass inspection since it removes the catalytic converters?

**jng2985** · 07-19-2013, 05:00 PM

Originally Posted by 2012mustang76123

so would the cat back system not let you pass inspection since it removes the catalytic converters?

It doesn't remove the cats it bolts to the cats and replaces everything to the tips

**TrueStreetTim** · 07-19-2013, 05:05 PM

Originally Posted by 2012mustang76123

so would the cat back system not let you pass inspection since it removes the catalytic converters?

Cat-BACK just means everything from the end of the cats (not including the cats) and back is replaced. Cats are part of the mid-piping.

Oh and the stock exhausr is pretty gd from the catback.

And this. From cat to axle-back is sufficient with nothing measurable to be gained.

**Dan12GT** · 07-19-2013, 05:07 PM

Originally Posted by TrueStreetTim

Cat-BACK just means everything from the end of the cats (not including the cats) and back is replaced. Cats are part of the mid-piping.

And this. From cat to axle-back is sufficient with nothing measurable to be gained.

Tim nailed it.

**2012mustang76123** · 07-19-2013, 05:29 PM

Originally Posted by Dan12GT

Tim nailed it.

noticed you have a catback vs axleback, did you notice anything?

**Dan12GT** · 07-19-2013, 05:36 PM

Originally Posted by 2012mustang76123

noticed you have a catback vs axleback, did you notice anything?

I never had an after market axle back on it so I couldn't say much for gains between the two. It had to have picked up something though along with my Airaid. I dyoned bone stock 372/359 and after Airaid intake / Borla S-type catback it was putting out 382/387 at the 1st TS dyno day last year. No tune yet. So I'd say the catback attributed to a bit of those gains.

re-rx7 · 07-19-2013, 04:37 PM

Originally Posted by DirtyD

Cat back systems replace all components of the exhaust system from the catalytic converters to the exhaust tips. Axle backs are from the axle back, which is the same thing as mufflers only.

And for the record, full exhaust is from the headers/manifolds back.

Oh and the stock exhausr is pretty gd from the catback.