Bug Muffler on a Bus--Help

[Rustungsesoteriker]

Recently, I aquired a 65 bus with lots of little problems. One is that the heat risers don't work all that well and it has an old extractor exhaust on a stock 1600. In my mind, extractors don't provide the heat necessary because of lack of plumbing in comparison to the stock system. So I am going back to VW. My bus is uncut and I want to keep it that way. But, I want a bug exhaust, not a bus exhaust. Inspite of some posts here the bus exhaust does limit upper end performance, even in comparison with the bug exhaust. So, the question is this: can I put a bug exhaust on a bus, using the bus stock damper on both exhaust holes? Can I push the damper almost flush with the muffler pipe hole on the right side and vent it behind the bus's end piece of sheet metal (the one with the hole for the left hand exhaust)? Is there room here for the damper go go behind? Otherwise, any suggestions?

[vwjosh6070]

if your bus is uncut, as in the rear apron hasnt been cut for two pipes, then you wont be able to use a bug exhaust unless you bend the passenger side pea shooter downward. i might have missunderstood your question tho.
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1973 Transporter "Floyd"

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KI4MXO

[ScrapJunkie]

You can use a bug exhaust with pea shooters without cutting anything, you just have to use 'Z'd' tailpipes. My friend has a pair of them on his oval.
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[joe cool]

Be sure that wherever you end up dumping the exhaust it won't get sucked back into the bus. Busses and bugs have very different aerodynamics (big surprise). On a bug the air flows over the top, down the back and away, dumping exhaust behind the car works fine because it is carried away. On a bus there is an area of spinning air, like a little horizontal tornado, that follows the bus around. Dump the exhaust here and it could find its way back inside. Hence VW came up with a different tailpipe for busses that dumps the exhaust away from this area and into the open air stream where it is carried away.
Plenty of headers are available which will allow you less back pressure in the exhaust and keep your heater boxes. I have one on my truck and it works just fine.

[Andrew]

If performance is really an issue, don't use a stock muffler to begin with... If you're going to use a stock muffler, though, you aren't going to notice enough of a difference between a stock bus and stock bug muffler to warrant worrying with trying to make a bug muffler work without cutting anything. There may be a little bit of a difference, but I'd be surprised if it was even noticeable while driving. Just do it right and use a stock bus muffler.
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-Andrew

[melville]

[Rustungsesoteriker]

[Rustungsesoteriker]

[66uno]

I havent tried this. But I heard you can heat up the outlets with a torch and bend them down. Then, you can use a "boom tube" (do they still make these?) to route the exhaust to the side like vw did. Seems like it would work.

I think also you might be able to weld one of the holes shut and run the bus exhaust pipe but I am not too sure about that either.

And of course, you can cut two holes in the bumper but that will really screw up your Karma.

[Culito]

Zoom Tube!!
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© CJ Industries, Inc.
'64 standard w/2.0L type 4
'62 bug

[KTPhil]

[Andrew]

[Rustungsesoteriker]

Thanks to everyone.

Melville, will those cool looking dual dampers fit under my apron without cutting the right side? It looks from your picture link that the apron is missing.

KTPhil, I am checking on those tubes as a possibility.

A muffler shop suggested that they could bend some tubing for me. Could something like a Z d pipe then be bent horizontally like a J laying down? This sounds complicated. Or should I choose one or the other design?

[Stocknazi]

can someone confirm that the only difference btw. a bus/bug muffler is the extra tailpipe exit hole and the gussets that help support the peashooters? i have a bug muffler and am thinking of welding the right hole closed and using it.
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[EverettB]

As far as I know, the inside piping is different for the 1 vs. 2 outlets. Welding up one side does not change the internals.
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[cdennisg]

I ran a beetle muffler with one hole welded up on my 68 single cab for awhile, it ran just fine. The other hole had a beetle peashooter tail pipe. I later installed a single QP with header, no obvious difference other than noise. (I hate the chirp of the pea shooters) That muffler is now on a friends 70 westy and still going strong.
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Confusious say it takes it takes two wipes to know you need three, but it takes three wipes to know it only needed two.

[Stocknazi]

[melville]

[wanta23]

is this bug exhaust? If so, it seems to fit ok, I don't see anything cut. Well, except the bumper

[Andrew]