Loud Exhausts

[Matthew E. Herd]

Gentlemen, I'm working on a project and had to temporarily replace my 'muffler' with a straight pipe off the header. I'm really not looking for max power, but had to run the pipe out the side because of space issues due to the aforementioned project. I'm looking for a quick and dirty solution (of the clamp on variety) to quiet down my exhaust so as not to cause dismay among locals for a future testing session. I'll share the results of my project once the data is analyzed, but that's another topic entirely ...

At any rate, some of my autocross buddies have a bolt that goes through the end of the exhaust and some sort of supertrapp style baffles they could bolt in for noise restricted lots. I was wondering if anyone knew what they looked like, as I haven't seen any of the local guys actually use them and up to now, I had a 'real' muffler (although it's still really loud). I was also thinking of trying a 'turn-down' to at least minimize the noise in the general area. I don't really care how loud it is inside the car, so long as the noise is restricted beyond about 50 yards to a reasonable (ricer level) racket.

 

[regularman]

If you want a removable baffle type. you might try a motorcyle muffler like a kirker and run it out the side

 

[ChrisS]

The Super Traps create too much back pressure for the noise reduction that you get in my opinion. Believe it or not but a good alternatve for a cheap muffler is the Thrush / Walker Turbo Muffler. I got mine from Summit, but you can get them anywhere. Expect to pay about $20.
https://store.summitracing.com/egnsearch....inresults=false
I don't have a link to the article but I think it was GRM that compared them and this came out near the top. I have a dropped seat pan so the exhaust comes out of a LCB header, makes a 45 under the tranny, then a spring loaded joint to the mufler and a short piece of pipe out the side in front of the RR tire. I can run the car in a garage without hearing protection.
For the track I can swap out the muffler for a straight pipe at the spring joint.

 

[Matthew E. Herd]

This is good stuff. Just what I'm looking for!

 

[Matthew E. Herd]

How much does this Dynomax muffler reduce your ground clearance?

Also, I already had the pipe made, so I'm looking for something short in profile. Once again, I don't really care about performance reduction at the moment.

 

[ChrisS]

It is 3-1/4" thick and I sucked it up close to the floor. If you have carpets you'll need to wrap the muffler. I'd say it hangs down from the floor 4", but only 3" or so below the bottom lip of the sill.

 

[Matthew E. Herd]

I also found this, which may be just the ticket if it actually works ...

https://store.summitracing.com/egnsearch....mp;autoview=sku

I was also curious how much a turn-down would really reduce the noise level. Does anyone have any experience with this?
I could always buy one and give it a try ... How expensive could they be!?!

 

[ChrisS]

This shows it pretty good

 

[Stoney]

Just as a random question...coming from a mustang background, has anyone tried a 2-chamber flowmaster on a MG or Sprite? I just wonder what type of sound it would make with a 1275?