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Would I need a retune if I change aftermarket downpipes?

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Old Feb 14, 2018, 07:19 PM
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Would I need a retune if I change aftermarket downpipes?
I have on the ets open dump but it's way too loud for me. I like the open bellmouth design on the ams. So would I need a retune if I swap over to that?
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Old Feb 15, 2018, 01:53 AM
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Whats wrong you dont like that train sound?? Thats what my EVO sounded like with an open dump, a ****ing locomotive on steriods!!
I would retune for any mod that changes air flow
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Old Feb 16, 2018, 09:45 PM
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So, going from open exhaust to closed... not exactly a direct swap as far as tuning. You'll have a bit more back pressure... so I'd agree with previous post.
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