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Discussion Starter #1
what is the difference between a custome exhaust like new 2 1/4 pipe and glass pack , and a catback exhaust
 

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Now, I'm no expert, but from what I understand a catback exhaust is just that. An exhaust from the converter to the tip. i.e. no headers and uses your existing cat.

So, a custom exhaust could very well be a catback exhaust if you keep your headers and cat, right?
 

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Discussion Starter #3
yeah im keeping the cat and stock header for now as soon as xmas is over im going to put race header and flex pipe on i just want to know if i get a custome exhaust put on after the flex pipe will it give me the same gain as a true cat back made for it or is it just going to be for sound only
 

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the gains made by an axle-back (since we have a front mount cat) are because of the loss of restriction and lowering of backpressure. the majority of these systems include a straight through muffler with some utilizing and additional resonator... the addition of a flex pipe lengthens the unrestricted area (also typically a bottle neck since the flex pipe is corrugated to allow engine movement) the use of a race header give an advantage of equal length tuned primaries which aid in exhaust scavaging....also creates a better vacuum pulling more fuel/air into the combustion chamber. the shorty header is used in the same way but attempts to retain the stock Cat location for emission purposes...the use of a high-flow CAT eases up the CAT bottle-neck while still retaining emissions. O2 sensor cheaters are dodads the trick the ECU into thinking everything is honkydory while running with either an off-road pipe (temporary pipe which replaces the stock CAT for RACE purposes and can easily be replaced for street driving...not as effective as a race header) or race header.
 

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Discussion Starter #5
all i want to know is say i went bought a glasspack and had the factory exhaust replaced from the flexpipe back would it be the same as buying like a magaflow cat back or mbrp
 
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