Burble/Crackles when letting off gas. Is back pressure bad?

[trophies]

I have X pipe and straight pipes back from the cats. When letting off the gas or downshifting into higher RPM's I get the burbles and crackles...from my understanding this is caused by some back pressure. Is this negatively affecting the engine/performance? Is is affecting fuel consumption primarily? It's eating at me if I'm losing some ponies or not...and I'm reading things from both sides of the aisle

[Rodizzle]

I have X pipe and straight pipes back from the cats. When letting off the gas or downshifting into higher RPM's I get the burbles and crackles...from my understanding this is caused by some back pressure. Is this negatively affecting the engine/performance? Is is affecting fuel consumption primarily? It's eating at me if I'm losing some ponies or not...and I'm reading things from both sides of the aisle

Normal man , nothing to worry about .


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[ENV²]

100% normal.

You should test drive a jaguar f type r in sport mode. It sounds like a war zone when you let off the throttle. Purposely done by manufacturers.

Sent from a misfiring cylinder

[MSq5]

Burbles may just be the exhaust system design. But crackles and pops (afterfire) usually mean that unburned gas is igniting after leaving the combustion chamber. The potential is there because direct injection forced induction engines run very rich.

This is considered to be bad for the life our catalytic converters as they are located very high in the exhaust stream. The additional heat close to them may damage the core.

It is probably not due to “backpressure”. Some aftermarket tuners that sell crackle tunes will not sell them unless you are catless. Jags, some BMWs, and other cars with this effect have their cats located farther downstream.

[TappaNuKegga]

+1. Post #4 is informative and spot-on accurate, as are all of the replies in here so far.

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