Exhaust Silencers - good/bad?: Grassroots Motorsports forum: Grassroots Motorsports Magazine

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Sept. 6, 2011 6:38 p.m. GTwannaB Reader

My Borla exhaust is getting to me, a little too loud, a little too much drone. I was looking into adding one of these simple exhaust tip silencers that you insert into your exhaust tip. Something like this:

I think you just drill a hole or two in your tip and slide this doohicky inside and attach via screws. Anyone have any experience with these types of silencers? I really don't feel like dumping money on a new exhaust while mine is perfectly functional if not a little annoying to my aging ears.
Sept. 6, 2011 7:38 p.m. bigdaddylee82 New Reader
I have never seen one of those, so no specific help from me but you don't need a whole new exhaust, just add a "resonator." I've known a lot of folks that had great results killing the drone by simply adding a glass pack before the muffler.
- Lee
Sept. 6, 2011 7:53 p.m. pres589 Dork

A lot of motorcycle mufflers from the aftermarket offer that sort of quieting "spud". I've never used one but I believe they insert on the inlet side of the muffler and not the outlet.

There was a pretty extensive thread about this here maybe 2 months ago, with ideas including rolled tips, resonator tips, resonators, small glass packs, and other options being shared.
Sept. 6, 2011 8:00 p.m. N Sperlo Dork

Reminds me of a plug of sorts .... I hear they work. Never tried them. Maybe look it up on youtube. I'm sure some shiny happy person has a full video on them.
Sept. 6, 2011 8:35 p.m. familytruckster New Reader

HKS exhausts come with silencers like that. They do a little, and mount on the outlet.

I too suggest just having a resonator added. Will work better to quiet the exhaust, and give it a much better tone.
Sept. 6, 2011 8:39 p.m. N Sperlo Dork

Try to set limits. Nothing too big.

EDIT: I recognize the photoshopping was horrible, and I do not take credit for it.
Sept. 6, 2011 8:41 p.m. novaderrik Dork

why would you put a bigger free flowing exhaust on a car and then choke it back down with a small outlet like that?

resonators are the way to go..
Sept. 6, 2011 8:43 p.m. familytruckster New Reader

novaderrik wrote:

why would you put a bigger free flowing exhaust on a car and then choke it back down with a small outlet like that?

resonators are the way to go..

On the HKS I have its the same I.D. as the pipe through the muffler..Doesn't hurt performance...
Sept. 7, 2011 7:43 a.m. cghstang HalfDork

I had a Megan (ebay) exhaust on my rallyx beater SE-R. It was very annoyingly loud. I bought one of the pictured "silencers" the day after installing the exhaust.

Like Mr. Truckster said, the ID is maintained through the silencer and I didn't notice any drop in performance. The exhaust was still louder than stock, but much more pleasant with the silencer.
Sept. 7, 2011 8:05 a.m. foxtrapper SuperDork

I've used and made that type. They work well at knocking down the high pitched crack sounds. They will not do as much for the deeper heavier frequencies.

You don't need to strangle flow by going really small, like that example does. Just a little bit of an internal lip does a fine job.