I just installed a cat back roush side exit exhaust to my 06 screw 4wd. It went surprisingly easy but now I have a whistle while driving it's not super loud just a whine while driving. The pitch gets higher if I step on the gas.

Any thoughts?

 

I'd check for a loose clamp

 

You have a leak somewhere in the exhaust.

 

yea, surely a leak. A long time ago, I had a '72 Dodge Charger with a 318. Nice car but was too quite. I decided to put a cherry bomb on it. Once I did it whistled exactly the way are describing. I moved clamps, changed clamps, added clamps. Made no difference until I went up to the local garage and they brazed it on. Whistle gone..............

 

Thanks for the replies.

My obx long tubes came in today so when I get those on this weekend I will tighten up the clamps or just weld it shut.

 

I'd weld everything.