Extra H-pipe On Exhaust

mhjo · Jun 27, 2013

I have a dual exhaust with two Dynomax VT mufflers and a H-pipe.

I often hear rattle from the mufflers on idle, so I emailed Dynomax and they said I should have a H-pipe in order to reduce pressure on mufflers. Well, as I already have a H-pipe, should I add a second one?

Rusty67 · Jun 27, 2013

Well, here is the deal. First off your mufflers shouldn't rattle. If the muffler is rattling there is something foreign inside, something inside has broke and come loose or it is loose on its hanger. I can't think of any other reason the muffler itself would rattle.

You can put a second H pipe in your exhaust but 2 h-pipes are not normal. I've only seen it done to eliminate drone or other problems caused by unequal pressure in the system. Dynomax mufflers are usually perty nasty sounding, are you sure it is the mufflers that are rattling and not something else in the exhaust system ?

BuckeyeDemon · Jun 27, 2013

it's probably the flap/valve inside the muffler that's rattling. i can't imagine a second h-pipe would help.

PoppyMod · Jun 27, 2013

Never, in my 50 years of wrenching on rides, have I heard of a 2nd HP pipe to cure anything, let alone a rattle.

mhjo · Jun 28, 2013

I have the Dynamx VT's with movable flaps.

http://www.dynomax.com/mufflers.php?muffler=vt

The rattle is asumumed to come from the flaps when they are closed (typically at idle).

BTW: I am very satisfied with the mufflers as they are free of drone and makes the car completely silent while cruising.

PoppyMod · Jun 28, 2013

mhjo said:
I have a dual exhaust with two Dynomax VT mufflers and a H-pipe.

I often hear rattle from the mufflers on idle, so I emailed Dynomax and they said I should have a H-pipe in order to reduce pressure on mufflers. Well, as I already have a H-pipe, should I add a second one?

I just watched the Vid. Sounds like a nice muff. I'm a little bothered by that "flap". As will it eventually stop opening due to increased blow-by?

2+2GT · Jun 28, 2013

mhjo said:
I have the Dynamx VT's with movable flaps.

Hmmm… I have a manual trans because I prefer more direct control. If I wanted mufflers that could be loud or quiet, I'd get these, selected for loud or quiet using a switch under the dash-

Rusty67 · Jun 28, 2013

Poppy, a second H cross over in exhaust is very uncommon but they have been done on various performance exhausts. It is usually to eliminate drone or undesired exhaust turbulence at a certain speed/rpm.

Extra H-pipe On Exhaust

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