Exhaust flapper

[thekevin]

I clamped my exhaust flapper to what I think is open on my 2018 about a week ago. I can’t tel any difference in the exhaust note and I don’t get any choppering in 4cyl mode like I expected. I am thinking about just having it cut off.

 

 

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[Mozzer]

I only noticed the difference at start up & idle with mine open. It is a restriction even when clamped open so should be better removed if the v 4 sound doesn't bother you.

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[thekevin]

I would have thought I would hear the difference when the arm came on, but I can’t. Am I right in thinking that it is completely closed when the truck isn’t running.


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[Bohanan23]

It is still a pretty big valve. I opened mine. I can tell a little bit on a cold start. Little bit throatier. But cut it out. Even with it open it's a big restriction. Plus it'll sound a lot better with an aftermarket muffler

[jaxcam02]

I ordered the magnaflow exhaust for my truck, and it has the god damned flapper. I installed it already but I am cutting it out and using the extra supplied piece of piping that came with the kit to replace the piece of pipe where the flapper is. 

When I clamped the flapper open it left behind a real annoying highway drone. When I cut it out I will probably have to put a resonator on it to cancel that 115 hz drone between 1500 and 2000 RPMs.

[thekevin]

That sucks because that is right where 90% of my driving is. I’m about 1700 rpm at 70mph.


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[jaxcam02]

3 hours ago, thekevin said:

That sucks because that is right where 90% of my driving is. I’m about 1700 rpm at 70mph.


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agreed, I'll probably end up building a j-pipe adjustable resonator to hit that frequency.