How much is my exhaust costing me???
11-18-2009, 10:54 PM
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How much is my exhaust costing me??? I have a 384CI LS1 with the usual bolt-ons, a mild 230/234 cam and pretty good heads.
My exhaust is pretty typical, 1 3/4 headers into 3" mandrel piping TO THE MUFFLER. I absolutely hated the exhaust noise, so I reinstalled the stock muffler. I hate cutouts as I have yet to find ONE that doesn't leak (regardless of all of the company claims that they don't).
As it exists, all of that piping is held back by a downsized pipe through a stock muffler. Any guesses as to what kind of power I am leaving on the table by not going high flow or a cut-out?
My exhaust is pretty typical, 1 3/4 headers into 3" mandrel piping TO THE MUFFLER. I absolutely hated the exhaust noise, so I reinstalled the stock muffler. I hate cutouts as I have yet to find ONE that doesn't leak (regardless of all of the company claims that they don't).
As it exists, all of that piping is held back by a downsized pipe through a stock muffler. Any guesses as to what kind of power I am leaving on the table by not going high flow or a cut-out?
11-19-2009, 07:14 AM
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on that setup...15hp is a good guess...could be 20
quite of few times people have dynoed 15hp gains with a cutout on a stock engine and exhaust. so behind a cammed stroker it would be that much more noticable.
i had an old manual cutout and it didn't appear to leak, at least not enough to hear over the regular exhaust noise.
now the electric c/o's....yeah i've heard them leak
quite of few times people have dynoed 15hp gains with a cutout on a stock engine and exhaust. so behind a cammed stroker it would be that much more noticable.
i had an old manual cutout and it didn't appear to leak, at least not enough to hear over the regular exhaust noise.
now the electric c/o's....yeah i've heard them leak
11-19-2009, 11:44 AM
#3
Like mentioned above, I think a solid 15-20 is probably killed by the stock muffler on a 383c.i. motor. It's enough to where I would be looking for a catback to put on it. If you are concerned with leaks, have an exhaust shop weld it up after you get it clamped where you want it.
Jon
Jon
11-20-2009, 08:07 PM
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Go with the Borla ProXS Mufflers they are the quietest and the most powerfull. Makes more HP than the cutouts.
11-21-2009, 08:21 AM
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I think 35 rwhp and rwtq on my setup https://ls1tech.com/forums/dynamomet...-en-close.html
on yours maybe less .... 20-25 maybe?
on yours maybe less .... 20-25 maybe?