Any how-to custom exhaust articles?

how does the straight pipe work? it just replaces the cat right? isn't that "illegal"?

straight pipe refers to having nothing but a pipe from the manifold to the exit from the car. but its term has also been adopted to refer to replacing any single component with a pipe to eliminate it.

and yes it is illegal to remove any working catalytic converter from a car. and if you have emissions it will not pass the required visual check on the emissions test.

A lot of people also refer to an aftermarket or custom cat-back exhaust system w/ no muffler to be straight piped. Not technically correct, but just a little more info for ya'.

I ran straight pips on my Plymouth Duster, god it was sweet. The sound, well lets just say everyone knew when I fired her up. Your car has to be set-up for this kind of mod, most cars need a certain amount of backpressure.
In Canada and most States you can’t run straight pipes on the street.

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Originally Posted by LarsBud

I ran straight pips on my Plymouth Duster, god it was sweet. The sound, well lets just say everyone knew when I fired her up. Your car has to be set-up for this kind of mod, most cars need a certain amount of backpressure.
In Canada and most States you can’t run straight pipes on the street.

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Ok, before someone comes out and flames you, don't ever say any car needs backpressure again. Backpressure is bad for any engine. What you are refering to is exhaust velocity. It is needed to keep the components cooler and help with cylinder filling. Other than that backpressure will only rob you of power.

Read more here:

http://autospeed.com/cms/A_1466/article.html

I’m old school, so straight pipes mean “drag pipes” no cat, on muffler, just header to pipe. Run that on a car not tuned for this set-up and you’ll be having issues.
Free flow is something different and works well on today’s street cars.

Quote:

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Originally Posted by LarsBud

I’m old school, so straight pipes mean “drag pipes” no cat, on muffler, just header to pipe. Run that on a car not tuned for this set-up and you’ll be having issues.
Free flow is something different and works well on today’s street cars.

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agreed

I meant high flow quiet, not can't hear myself think and people in the next county can hear me exhaust lol. Just kidding, does changing the exhaust on these cars make that much of a difference anyway? I was reading somewhere that the Swift utilizes the most performance from its factory exhaust, in that changing it would do squat. I don't know about the aveo though... looks like it could use a little more mojo in that field, but like I said I don't know.

there was a "noticeable" difference in acceleration after i swapped out my stock muffler. plus the weight difference was impressive.

with the muffler swapped, and then adding a cold air intake (any intake really) really brought out the engines performance.

lol the stock muffler has heavy :lol: