loudnlow

I just installed a Pypes O/R H and I have flowmaster 40's on my car and when I am driving it makes this rattling sound at certain RPMs. I listened to similar set ups on youtube and all of them do this rattling sound. I thought I had something broken inside my muffler.

Is this what everyone refers to as the trumpet effect?

Is there anyway to fix it?

Would I be better off going with a straight through design muffler?

gman73

Flowmaster may still have a problem with I believe the baffling or something else coming loose inside of the muffler. Here is a video that you can hear trumpeting. At 11-12 sec you can hear it. http://www.youtube.com/watch?v=5P9yl...layer_embedded

Don't go straight thru design as this combined with o/r h would be loud, obnoxious and would trumpet.

loudnlow

So stay with chambered with my mid pipe set up?

gman73

I have also heard that O/R H and flows tend to trumpet. You will be able to hear it while driving and then stepping on the gas. Adding a resonator will reduce or get rid of the trumpeting.

05fastblk

that was my first set up. it sounded horrible! (imo) so i went with a borla and even then i ended up adding pypes high flow cats to the H cause it would "trumpet." never had the flows with the cats it might sound good. It sounds amazing with the borla.

loudnlow

I want it to be really loud and obnoxious but just the rattling noise is weird did your borlas do the rattling thing or just trumpet a lot?

MTAS

It's not the mufflers, it's any off-road pipe. Removing the cats is what does it.

crescent_wrench

Nothing loose in my Flows after 3000 miles.

loudnlow

Has anyone heard the pypes mid muffler system in person? It sounds sick on brenspeed

howarmat

exactly...the muffler will not really change this issue, but borlas are best IMO with an o/r h pipe