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Exhaust 4.7L Exhaust Discussion


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Old 09-22-2010, 03:51 PM
BigOrange BigOrange is offline
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Default Exhaust Sound/Performance

So I've been experementing with different muffler combos trying to get the sound and performance that I'm looking for. I started with a SI/SO 14" Magnaflow with the stock pipe exiting behind the rear pass. wheel. Sound was exactly what I wanted, but the butt dyno didn't feel enough gain.

Next I tried an SI/DO Xlerator (supposed to be same as Magnaflow) with pipes going straight out the back. This produced a bit better acceleration, but brought a wall of drone from 1500-2200 RPM that was not to my liking. You couldn't tell that it was a V8!!

Now I currently have gone back to a SI/SO 14" Magnaflow with a 3" to 2.25" Y-Pipe going to dual pipes out the back. This has given me the sound I like back, but again, the performance seems to have dropped back again. It doesn't seem to have the top end power that the SI/DO had, and feels like it struggles to get up hills and such.

Hopefully some exhaust experts can chime in here.... Would a SI/DO muffler flow better than a SI/SO with Y-Pipe? Or, is my computer possibly still adjusting to this new setup? I've been running this newest setup for 5 days now. I unplugged my battery after the install to do a computer reset, and the exhaust is running in conjunction with an Airaid Intake Tube to the factory airbox with a K&N drop-in Filter.
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Magnaflow 14" SI/DO, No Resonators, K&N Drop-In Filter, De-badged.

Last edited by BigOrange; 09-22-2010 at 03:54 PM.
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Old 09-23-2010, 05:37 PM
BigOrange BigOrange is offline
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nobody has any ideas or thoughts?
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Magnaflow 14" SI/DO, No Resonators, K&N Drop-In Filter, De-badged.
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