Borla XR-1 40085 Questions

[Tgmorley2]

Hey guys I'm new to the forum but I've been having some exhaust issues, and I'm hoping someone can help.

 

I just recently swapped my muffler for the borla XR-1 (40085) muffler and deleted my resonator. I left the valve after the OEM muffler and then dumped the exhaust after the rear axle, no tip, just pipe.

 

Ive been having an issue with a whistle or "whoosh" sound whenever I accelerate or whenever I have a warm start. I've gone to a shop to have them check the welds for leaks/gaps and there doesn't appear to be any issues and I still have the sound. Has anyone else had this issue with this model #? Could it be a defective muffler?

 

Also, would adding an exhaust tip to the dump after my axle fix this issue? I'm open to all options at this point since it's not a leak like I was thinking.

 

 

Thanks,

[juscuzram]

I'm thinking it's the valve. Clamp it open and see if it gets any better / worse.

[Tgmorley2]

Will that affect back pressure?

[Jaychevy81]

It could be the pipe was it cut it may have a burr on the end causing the exhaust to roll as it exits. Or where it dumps could be a pocket of air flow or something.


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[M1ck3y]

1 hour ago, Tgmorley2 said:

Will that affect back pressure?

Back pressure? Better out then in.

[Tgmorley2]

2 hours ago, Jaychevy81 said:

It could be the pipe was it cut it may have a burr on the end causing the exhaust to roll as it exits. Or where it dumps could be a pocket of air flow or something.


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How would you check this at the inside of weld locations, short of cutting the pipe and redoing the welds?