CSS muffler, need advice

[Leonardp]

Thinking about adding a CSS muffler to my setup, which is currently a Ultimate Racing downpipe and stock catback. My question is, would it be prudent to replace the mid pipe with a 3 inch rather than retain the stock pipe? Comments appreciated

 

[SonicBloom]

I think you’re going to get a lot of drone if you don’t have a resonator.

 

[GTI Jake]

Even with a 3” Midpipe (proper resonator) the CSS is pretty rowdy with a aftermarket downpipe

It will absolutely drone with the factory resonator.

 

[seanmcd1]

is y'all in the right section?

 

[Doge]

I had the UR downpipe (400 cell ceramic cat + their own resonator), replaced the stock resonator with Vibrant 17930 resonator and CSS muffler. While the 17930 gets rid of a good amount of the drone range, it still droned quite a bit between 2.7k - 3.3k rpm, and it was LOUD past 3k RPM. The CSS muffler only stayed on for a week for me.

I know level of loudness is very subjective to everyone, but it's going to be loud even with a proper aftermarket resonator.

 

[seanmcd1]

Still looking forward to hearing this muffler on a GTD guys...