View original topic: Exhaust FAQs - Stock & Aftermarket Exhaust Topics Page: 1, 2, 3  Next
Fun 181 Thu Dec 11, 2008 10:55 pm

Another hot topic here in the Thing forum is exhausts. Thing owners have some pretty specific concerns when it comes to exhausts, whether it's stock or performance. Hopefully you'll be able to find helpful information in these previously discussed topics. Note that, like other popular topics, you will find a LOT of overlap in the information discussed, but each topic may also offer unique info that you will find useful.


Thing exhaust systems
OK, here we go...

Rob & Dave's Aircooled Volkswagen Page - Muffler Discussion
A great site that covers all the basics and then some...

Exhaust question, will this work?
This topic starts off asking about stock exhausts and then goes on to cover many other aftermarket systems...

Ceramic Coated Exhaust
Discussing the ceramic coated Tri-Mil and other systems...

OE style exhaust
A short post regarding the stock exhaust set up...

Aftermarket Exhaust
A great discussion on aftermarket exhaust systems...

Which muffler system rocks your socks off?
More on aftermarket exhausts (like I mentioned above, you'll find a lot of overlap in the information covered)...

Installed the "tri-mill" exhaust from ISP yesterday
More info on the Tri-Mil exhaust...

New "Wild Boar" Exhaust system
An older thread which also discusses the "Wild Boar" exhaust, better known as the Tri-Mil exhaust system...

Which exhaust for easy valve adjustment and good performance
This one starts out with "I know, I know, another exhaust thread." However, there is a lot of great info about different systems (A-1 Sidewinder, Kymco, S&S, etc.) and the ability to access your heads for valve adjustment...

Here is a photo showing the clearance between an S&S merged header system and the valve cover...

* "Notice the bracket towards the back(front of car) of the picture. See the rust, it was re-welded there, numerous times. Thats the weak point of the S&S system. That bracket hangs off exhaust port studs for #1 & #3 cylinder." - mattt

Rust protection for muffler?
Some good info on POR-15 and rust inhibitors...

Thing Muffler
A topic that starts out asking about bug "pea shooters" and goes on to cover other issues...

74 muffler
This thread discusses fabricating a stock-looking exhaust system...

Any ideas on exhaust
A lot of redundant info, but also some new info regarding exhaust clamps...

Stock 1973 Muffler Clamps and Nuts and Bolts
More info on exhaust clamps...

Exhaust Fume Question
A topic addressing concerns about exhaust fumes...


From The Thing Gallery
Here are a few random exhaust images that you may find interesting...

"Trekker with TypeIII thunderbird muffler"...

A freshly installed "Pea Shooter" muffler with J-pipes...

A Type 4 with a merged 4-into-1 system...

NOS parts and pieces from a 1973 exhaust...

Merged and swept off to the side...

Another merged header system (appears to be ceramic coated) from Switzerland. Note that this is not a "Sidewinder" exhaust...

Here is a photo of a '74 with ceramic-coated heater boxes prior to the exhaust installation...

Installation of a A-1 Sidewinder exhaust...


After searching through this forum it is safe to say that exhausts have to be one of the most frequently posted topics - ever. Feel free to search on your own, but I went back several years and found that most of the information remains the same, and has been covered multiple times. I tried to compile the most useful and relevant topics above.

I hope you'll find this helpful. I'll update this thread as more info becomes available.

- Slim

Ian Epperson Fri Dec 12, 2008 9:27 am

Thanks Fun181! Very useful.

Small nit: Can you edit the post to remove all the &highlight= to shorten up the links and not actually show the highlight on the resulting page?


is the same link as this:
But without any highlighting on the resulting page.

Captain Spalding Thu Feb 12, 2009 11:20 am

joosty_chin Tue Feb 17, 2009 1:13 pm

Captain spalding has the best exhaust ive seen, and GMW doesnt have it any longer

j5josher Fri Feb 20, 2009 3:48 pm

just for a hint most of the websites on the posts are outdated and do not show any photo's or info any more...

sad stuff :cry: :cry:

Fun 181 Fri Feb 27, 2009 10:21 pm

j5josher wrote: just for a hint most of the websites on the posts are outdated and do not show any photo's or info any more...

sad stuff :cry: :cry:

Well, I'd say this is a bit of an exaggeration. I just went through each thread above and found that the majority of the links to vendor web sites work just fine. Obviously, you can't expect any link to eBay or the Samba classifieds to remain current for long.

Yes, a few of these topics pre-date 2007, but the information in these old threads is still relevant, even if a few links and photos aren't showing up. Many of the "dead" links still lead you to a vendor website where you can search for the part you're looking for.

I also found that quite a few of the missing photos are reposts, or are in quotes. As far as I can tell, there is at least one photo of every kind of Thing-specific exhaust, as well as a broad assortment of other exhaust photos currently featured in at least one of the above threads.

Emeritusx Mon Aug 10, 2009 8:59 pm

Tri Mil Exhaust

Solomon Grundy Wed Oct 21, 2009 10:37 am

These S&S exhaust systems are great. The one on my '73 is over 15 years old and still running strong. Way better flow for the larger engines then the one's the Thing shop has.

I can adjust the valves with the system on but it is tight and take twice as long as doing my Ghia.

mondshine Tue Oct 27, 2009 6:40 pm

Here's a quick writeup I did for the S&S system many years ago.
Regards, Mondshine

Captain Spalding Tue Dec 15, 2009 8:59 pm

I was surfing around and came across this stainless steel exhaust from the Thing Shop. I'd never seen it before. Comes raw or polished.

sam_w Fri Feb 12, 2010 12:25 pm

I have a OE German exhaust on my 73 Thingster, and it has the pea-shooter sized exhaust pipes and no coupling between the left and right sides. It really could do with more have power, and I do have a free-flow header in my parts stash.

I have been off-roading with the SoCal Bajas, and really apreciate the ground clearance and the Thing engine guards.

How much will I lose in clearance, if I replace the OE exhausts?

I am in Vegas right now and will measure my exhaust when I get back on Tuesday, but feel that the extra 5% oomph may not be worth it.

wbrown45 Sat Feb 20, 2010 8:42 pm

I am really wanting to find the S&S Thing exhaust system. Does anybody know if this is still available in somebody's old stock or a stash somewhere?

yellow73kubel Sun Feb 21, 2010 5:39 pm

sam_w wrote: I have been off-roading with the SoCal Bajas, and really apreciate the ground clearance and the Thing engine guards.

How much will I lose in clearance, if I replace the OE exhausts?

If it is a Beetle header, I would live with the lower power. I used to have a header on my Thing. It left about 8 inches of ground clearance and stuck out 2in behind the bumper. Basically a horrible departure angle. Ended up backing into a small berm and smashing the exhaust towards the engine tin.

The Tri-Mil Thing exhaust has very good clearance, equal to the stock '74 exhaust. It almost tucks above the lowest point on the rear part of the body, and presents a much smaller profile widthwise. No performance difference compared to my header. If you want to visualize it, the can is 4in diameter and roughly 12in wide. Top of the can is just underneath the bumper, and the rearmost part is about in line with the frontmost part of the bumper. I think the can could do to be moved up some, but I no longer fear running it into the ground.

rrankin Fri Mar 12, 2010 12:57 pm

Does anyone have any idea on how much room The Thing Shop new system leaves for adjusting the valves?


Thingamabob Sat Apr 03, 2010 1:29 pm

I have a Kymco 1 5/8 header with a hideaway muffler....fits good. I had to take off the bumper. After...I went to put the bumper on.....I had to do some work...

First- After the system is on..Heat up the exhaust at the collector end of the muffler and push down...slightly.

Then- Bend the bottom of the bumper up/ where it goes back under the car.

This is what I did! The guys at Kymco said it should work without any modifications.. :?

Ian Epperson Sat Apr 03, 2010 2:17 pm

rrankin wrote: Does anyone have any idea on how much room The Thing Shop new system leaves for adjusting the valves?

Rob Answering a bit late, but I had almost that exact same system on my car for years. The mufflers get in the way of adjusting the valves, but I did learn how to do it with them in the way. I picked up a set of angled screwdrivers, but found that a dime was enough to hold the screw in place.

The system isn't an extractor system - it will not give you the additional power that the S&S system will. I went from an S&S header to that divided Thing shop header and lost a few HP.

Yarkle Sat Jul 17, 2010 3:23 pm


how loud is the thing shop exhaust?

allansasson Tue Jul 20, 2010 3:43 pm

Yarkle wrote: Ian,

how loud is the thing shop exhaust?

I run one on my 74 with stock 1600 for the last 5 years and it is fairly quiet and gives great ground clearance as nothing hangs under the motor.

Yarkle Tue Jul 20, 2010 4:32 pm

thanks! Ive been wavering back and forth between shelling out @200 for the cip1 74 exhaust, which i know will rust out in time, and dropping 400 for the thing shop exhaust, which is stainless steel.

Does the thign shop exhaust still have that kind of "brrrrrr...sound" to it? Not quite a beetle fweem , but still ACVW?

DannyK Wed Sep 08, 2010 9:30 am

I installed the polished Thing Shop split exhaust system on my '74 a couple weeks ago. It fit well and looks great. It sounds good, quiet, but with a liitle purr and rumble. I can feel more power and the motor revs easier. I had the S & S header with twin pipes before, which makes little since. One collector and then bolting on two mufflers and routing forward and the back again? Why ? Next, I had removed the twin S & S mufflers and rewelded a bug glass pack to fit the header and that was a big improvement in flow and weight savings. The polished Split Thing Shop system is even better, It sounds, looks and performs great !

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