You do bring up a point I had thought about and disregarded.
An overly restrictive muffler or some other clog could definitely
reduce power. But you will feel the loss in power, probably well
before you see a change in fuel economy. The OP described loss in
fuel economy only.
As for too little restriction, these cars don't have issues (aside
from emissions legality and sound level) when running straight pipe
exhausts. I believe the too little restriction thing is largely a
myth, in fact.
Dave
On Jan 3, 1:51=A0am, AS <do...@[EMAIL PROTECTED]
> wrote:
> A muffler with the wrong size (capacity) or wrong diameter pipe will
> affect more than fuel consumption, can even lead to engine overheating,
> poor performance, etc.
>
> Remember that for some engine conditions require back pressure in the
> exhaust pipe and others require free flow.
>
>
>
> pgg wrote:
> > A couple months ago, my 2000 Maxima with 68,000 miles start making
> > terrible clunking noises from the muffler area.
>
> > My head wasn't on straight that day and I took it over to Meineke.
=A0A =
pipe
> > was rusted out and hanging...they said even though the original
stainles=
s
> > steel muffler was fine, they had to replace the muffler to replace the
> > connecting pipe. =A0I said "fine".
>
> > I know...dumb move in hindsight and I wish I would have taken it
elsewhe=
re.
>
> > Well the Meineke muffler was $220 or something like that and
looks/works=
> > fine.
>
> > However I swear I get 3-4 MPG less than I used to. =A0Possible? =A0I
als=
o got
> > the MAF sensor replaced in the same time period...- Hide quoted text -
>
> - Show quoted text -
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