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Its a true 2.5" The end where the mufler bolts on is necked down to about 2.25" so you can put the stock mufler on. Nothing a dremel tool can't fix
 

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ya, it is right inbetween both of them. it is about 62-63 mm for some reason. I don't think the greddy will bolt up anyway. it does have that cheezy neck down though. actually it is a plate that is just as big as the i/d of the stock muffler, so it would not blow out gaskets and that kind of crap.

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98 se-r w/ p/r cai, stillen header, courtesy exhaust, JUN flywheel, ACT clutch, NOS nitrous kit, eibach springs, kyb struts, st sways, cusco camber plates, f/r strut braces, lotsa bushings, and a bunch of other crap not really worth mentioning
 

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www.motorists.org
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Lotsa Courtesy exhaust info:

http://www.se-r.net/header_exhaust/courtesy_exhaust.html

Measurements of the stock B14 B-pipe just for general info:

Starting with the b-pipe at the catalytic converter:
1.800" inside
1.918" outside
2.151" middle, before resonator
3.447" the resonator
1.696" before 1st bend
1.540" @ the 1st bend
1.696" before 2nd bend
1.542" @ 2nd bend
1.684" before 3rd bend
1.553" @ 3rd bend
1.692" before 4th bend
1.562" @ 4th bend
1.667" before final bend
1.519" last bend before pipe enters muffler



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Ben98SentraSE
98 Sentra SE TURBO
 

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466 Posts
I paid $189 shipped with no group deal. With the OE muffler, the car is quiet, but can be loud if you push it. I felt an immediate improvement, and the dyno showed a 5hp increase.

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Eric Waterman
1996 200SX SE-R
1997 200SX SE-R
1991 Sentra SE-R
 

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Whisky Tango Foxtrot
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863 Posts
<font face="Verdana, Arial" size="2">Originally posted by Mike Gosselin:
Its a true 2.5" The end where the mufler bolts on is necked down to about 2.25" so you can put the stock mufler on.
</font>

I measured mine with a metric tape messure to exactly 60mm several times to verify. It is 60mm


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Sean
97 SE-R w/misc. goodies
 

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466 Posts
the hp gain was with my rusty Stillen muffler. I lost a few horses with my OE muffler, but my ears and head are happy.

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Eric Waterman
1996 200SX SE-R
1997 200SX SE-R
1991 Sentra SE-R
 
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