Weird Noise From Side Pipes....Search Performed...Additional Questions

[427BDR]

Originally Posted by Cashburn

You should put your car on a chassis dyno and see. Those Smeding motors, just saying... Our smaller engine Coyote car just did 715rwhp

The sound you are not used to is the sound of a glasspack muffler. Yes, these are glasspacks... and they save upwards of 50hp (if you are actually making 600hp, it's all relative).

Jay can you elaborate? That's the second time you mentioned the smeding engine implying it may be the source of the issue. My engine was dyno'd and made ~581hp. I'm just trying to find a fix for these awful sounding backdraft pipes, so any experience you can share is much appreciated. If your 700 hp coyote doesn't cause the pipes to rattle then Maybe we have busted baffles?

Alistair is also exploring potential fixes so all input is appreciated. Thanks in advance

[Mark Brye]

I had a sound similar to what you guys are talking about. I pulled the side pipe off and put it on my bench and started taping on it to see if I could make the sound. What mine turned out to be was a rock that made its way in between the four primary pipes and made its way down to the collector on the outside of the exhaust. It made a horrid racket. Turned the pipe on edge and the rock rolled out.

[Mark Brye]

Originally Posted by Mark Brye

I had a sound similar to what you guys are talking about. I pulled the side pipe off and put it on my bench and started taping on it to see if I could make the sound. What mine turned out to be was a rock that made its way in between the four primary pipes and made its way down to the collector on the outside of the exhaust. It made a horrid racket. Turned the pipe on edge and the rock rolled out.

So this has happened twice now in the 14 years I have had my BDR. Little rock between the 4 to 1 side pipe collector. On outside of exhaust but rattling between the 4 tubes. Made a real racket both times. Had to take side pipe off and turn on end to get the bugger out.