Opinions about exhaust noise

jpajkos

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Questions guys. I have a Catted X with flowmaster catback. Every since I put in the P.I. motor and had all the work down when you rev it up and it comes down a get not the crackling noise but like a pop a loud one almost sounding like a back fire. What could cause this? It never did it with the old motor. It sounds like it comes from the driver side area where the cat is. Any suggestions?
 
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jpajkos

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Just headers that came off the PI motor. Are they any different from a NPI?
 

Dalamar

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Not sure if they're different, but it's the manifold type.
The maniflods will pop a lot whey you're decelerating, mine sure did, PI's, stock manifold, prochamber and catback.
Not sure if there's other causes, but it's louder with "louder" exhaust.
 
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scarface

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It is probably the excess fuel being burnt. Different heads, different characteristics.
 

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