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Old 11-04-2007, 08:23 PM
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4" Exhaust

Is it worth putting in a 4" Exhaust on a 2000 Excursion psd?
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Old 11-04-2007, 08:23 PM
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Yes..... and a better flowing intake too
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Old 11-04-2007, 08:26 PM
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I have a KN filter on the intake -- is that what you mean?
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Old 11-04-2007, 08:30 PM
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oh.... i would def take out that K&N... they let in too much particles that can mess up the fins in the turbo.... they may let in more air but they also let in more dirt too..... i would switch to a AFE intake or the DIY intake...
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Old 11-04-2007, 09:19 PM
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The K&N have a bad habit of not sealing and letting crap through damaging the very expensive air compressor you drive.

Exhaust will let the EGT's cool down a little so you can keep your foot into it more. However it has been said that with a stock truck the 4" down pipe will loose some of the low end spool up. Those folks say the 3.5" down pipe is the way to go. I do not have a stock truck so I can not answer it this is accurate.
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Old 11-04-2007, 09:42 PM
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mine is stock minus the 4" turbo back and it is 4" right behind the turbo. no problems here. gotta love the sound it makes now
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Old 11-04-2007, 09:58 PM
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Did you ever tow with it and did you notice a difference in spool up while under load?
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Old 11-04-2007, 10:20 PM
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nope. it seemed to pull better with the exhaust. up hill was about even with stock exhaust, but take off seemed much better and easier for it. as you know i was puuling our pull tractor around. i had it on for the bishop pull so it got some good hills between there and bakersfield.
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Old 11-04-2007, 10:33 PM
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Now I know you. Of course. You pulled the tractor up to Reno as well and up to that pull before Reno in BFE, Nevada.

Thank you for the info on the exhaust. I can't wait until next pulling season. I got my truck done. Look at my signature for my latest dyno and drag strip times. I have turned up the fuel since then, this wednesday I go to the track again.
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