91 Civic muffler

I have a 91 Civic Std. HB. I have already gone through a few mufflers, they
don't seem to last too long. I decided to spend a little more and get
something better this time. I have couple of questions though. I would like
a muffler with dual pipes. Would an SI muffler fit my car? I wouldn't mind
some extra power (but not too loud), what aftermarket performance muffler
would you recommend? Any help is greatly appreciated.

 

yes, it will fit, but

1. the twin tail is for show, not power. it's twin pipes /ahead/ of the
muffler that help, not after.

2. the std has an under-ratioed 4-speed box, a restricted tandem valve &
a low lift cam. again, anything other than a standard muffler is pointless.

if you want a cheap increase in power, dremel off the tandem valve pivot
shoulder so it opens fully, go to a junk yard & get the si cam, and most
of all, get the 5-speed box so you're not pulling 5000 rpm @ 75mph.
trying to go faster in an std is like beating a bees nest with a stick.
noisy & painful.

 

Thanks for the great information, it is very useful. I will watch out for
those bees

 

Do you make a lot of short trips? If you don't drive far enough to heat
up the exhaust system, you can get condensation in there, and it will
rust through from the inside. If this is your problem, perhaps a
stainless steel muffler would be the way to go? Just a thought

 

On my '90 LX the original muffler lasted 7 years. Muffler shop replacements
lasted 3 years. So, the last time I needed one, I bit the bullet and got an
original Honda muffler. The problem with these cars is that the muffler
being way in the rear doesn't heat up enough to evaporate the water out of
it. So you need a good muffler. Can't help with aftermarket, but one of
the Honda dual outlet mufflers should fit (like from the SI) but as others
have pointed out, that's just for show, not performance.

WW