Engine Braking with exhaust change

[CND Supercrew]

Just curious if engine breaking would be affected from lack of backpressure from a cat back versus the factory exhaust?

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[TexasTruck]

I wouldn’t think so, maybe a little since the exhaust flows a little more. Most of the restriction comes from the catalytic converters in the Y-pipe.

 

[Davidwnuc]

https://www.uti.edu/blog/automotive/what-is-engine-braking

i dont see why an exhaust system change would any noticeable impact on engine braking.

 

[miniceptor86]

Grew up calling it compression braking. Sounds better than vacuum braking.

 

[Rinn69]

My Borla (dual rear exit) hasn't had any effects on mine. I've had it on since last fall and drive mainly in Sport mode in town.

 

[Truckguy24]

Yes others have said I wouldn't think it would change very much. These factory exhausts are so good these days that I think the performance benefits of anything aftermarket exhaust related are severely overstated. There's not a lot of performance left on the table for that anymore.

 

[fmdog44]

Unless you want to reduce 1/4 times by a few 1/10ths of a second performance exhaust and intake filters are a waste of cash. My stock exhaust is beautifully quiet at idle and nut cracking when hammered.

 

[CND Supercrew]

I believe some are missing the context. I'm towing 7k, going downhill. Does the the factory exhaust provide better back pressure to assist in engine braking then a free flow catback?

 

[TremorDave]

Transmission mapping will have a much greater effect than the tiny amount that some reduced pressure would cause. Even changing one model of tire to another within the same brand would have a greater effect. I think overall the point I’m trying to make is that it would be minuscule, but I could be wrong.

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