aribert New Reader
June 21, 2016 11:39 a.m.

Some time back there was a very short article by Andy Hollis about repacking a sealed muffler. Anyone else here repacked a muffler that is not intended to be repacked?

I have a Spit bodied GT6 (with a Mazda diff like the Ro-Spit, thanks GRM - I have not sheared (Triumph) diff teeth now in the better part of a decade). I have a turbo tube muffler below the driveshaft and a pair of (Dynomax?) mini turbo mufflers at the end. While I like the sound / tone of the exhaust, I want to make it more subdued.

Based on an internet search, it appears that stainless steel wool lasts much longer than fiberglass. I found a source local to me and ordered a small roll of course stainless wool and a sheet of stainless wool with a stainless screen mesh. Based on my muffler configuration how should I place the material?

My tail end of my GT6 exhaust: I cut open one of the cans (I made a jetting change last fall that reduced the fuel mileage by 4 mpg - it shows in how the holes in the tubes are almost completely plugged: In hindsight I think I should have just cut out the center between the two baffles. I could stuff the roll material thru the existing holes in the baffles. I also did not realize that there were two layers of metal - On the 2nd unit I intend to stagger my cuts so that there is overlap between the layers, easier when its time to weld things back up. This is what the two materials look like

I bought the stainless material before cutting open the muffler can. And foolish me, I cut the 8.5 x 20 sheet in half before opening up the muffler. The idea is to wrap/weave the sheet between the two tubes and use the roll material in the ends.

Your thoughts/suggestions?

aribert New Reader
June 23, 2016 9:41 a.m.

BTT Anybody?

GameboyRMH MegaDork
June 23, 2016 10:40 a.m.

Wrap the perforated part of the tube leading to the outlet with the screen and then stuff the center chamber full of stainless steel wool.

You'll need to log in to post.

Also on Grassroots Motorsports

Follow Us to the Nürburgring

4 hours ago in News

Follow along as James Clay from BimmerWorld contests his first ADAC Zurich 24-Hour race at the Nürburgring.

You Need This: 2005 Lotus Elise

4 hours ago in News

A Lotus Elise looks so right in British Racing Green.

2017 Mazda MX-5 RF

6 hours ago in New Car Reviews

We're big fans of the Mazda MX-5. Now Mazda went and put a retractable fastback on their fourth-generation car. So, ...

From the GRM Vault: Test Driving BMW's E30 M3

9 hours ago in Articles

We tested BMW's E30-chassis M3 back in 1989. Here's what we thought.

Project Ramp Truck: Installing Sound Deadening

10 hours ago in Project Cars

Time to cut down on heat and road noise making its way into the cab.

Eric Foss Sets Fastest Time Ever at the Tire Rack Ultimate Track Car Challenge

1 day ago in News

47 of the country's fastest cars battled it out for track supremacy.

Who Wants to Design the Next GRM T-Shirt?

1 day ago in News

Blipshift is involved, so you know that it will be cool.

Reader's Ride of the Week: Improving Upon the Ultimate Driving Machine

1 day ago in News

This E36-chassis M3 just keeps getting better.

What Was the Most Powerful Car at the Grassroots Motorsports Dyno Day?

1 day ago in News

What if we told you it was an Audi?

Up to the Challenge

4 days ago in Articles

Torque: It's how Glen Bunch's vintage Dodge keeps pace with today's machines.

This Friday: The Ultimate Track Car Showdown

5 days ago in News

Come watch some of the country’s top track cars duke it out for fame, glory and some tasty prizes.

You Need This: Metallic Brown Toyota Celica

5 days ago in News

This looks a lot like one that we had in our fleet back in the day.


Grassroots Motorsports Magazine

Subscribe Today

Also get your instant access to the digital edition of Grassroots Motorsports Magazine!

Learn More