Here is a hot to for the mod i mentioned in a different thread.

Goal: Remove Chambers from stock muffler, get AWSOME subie sound, and reduce back pressure.

Tools needed:
Wrench 12 or 14mm (not sure)
Sawzall or Air dremel
Drill
Welder
Hammer(s)
Thick Sharpie

Parts Needed:
New Exhaust Gasket ($8 from dealership)
2' of 3" steel exhuast pipe ($10 from local exhuast shop)

Procedure:
1.) first thing to do is to jack up the back end of the car, or squeeze your way under. while under here you will want to remove the exhuast hanger bushings so the exhuast hangs down. ther are three hangers. these should pop off with relatvie ease. next you need to undo the two bolt that hold the muffler section the rest of the exhuast. these bolt are either 12 or 14mm. CAUTION: on older cars these bolt will be heavily rusted. and may not come out. so dont force em too hard unless you have replacements handy.
2.) with the muffler removed from the car it is time to open it up. this is realitvely simple to do. mark out the area you want to cut out. you will be cutting out a squar that is the entire length of the muffler and goes down each side a couple of inches. after marking it drill some pilot holes in which you can get you saw in. start cutting. DO NOT discard this piece once it is removed. you will be using it again to cover up the hole you just cut out.
3.)this is the hard part. you have to remove all of the chambers and extra piping from the inside of the muffler. you will want to leave 2 or 3 inches of the inlet pipe in the muffler, so dont cut it flush. besides that go nuts. that chambers are pressure fit in there, and so are the pipes that connect them. it works well to cut out the pipe segemtns inbetween the chambers and then pound out the chambers.
4.) now that you muffler is completely empty except for a few inches of the inlet pipe you are ready to create the outlet hole. on the outside of the outlet end of the muffler there is the outlet pipe. and about 1.5" above it is a circular depression. use this as a guide. draw a 3" diameter circle using this guide. your circle should encompass the stock outlet pipe. if not modify it so it does. now you will need to cut out this marked off area. so start some pilot hole. and go at it with the saw.
5.) now you have an empty muffler with some inlet pipe in it and a 3" hole at the bottom of the other side. you can now slide you exhuast piping into the hol eon the outlet side. as you slide it in try to angle it so that the exhaust pipe will fit over the inlet pipe. with this done, you can mark the pipe so that you can cut it to make a good seal agains the muffler wall on teh inlet side. you can also mark it on the outlet end to make it look level and not angled down. after this is done you can cut the pipe.
6.) withe your pipe cut so it make a good seal on the inlet side, you can go ahead ans slide it back in, and make it seal goo against the wall. now you will bust out the welder. you will be welding the exhasut pipe to the inside wall of the muffler. becareful not to melt through teh muffler. it is double layered so its not easy to melt through. once it is welded in place with a good seal you can weld the pipe in place around the 3" hole you cut.
7.) with you pipe welded in place, you can now go ahead and weld the top piece back onto the muffler. resealing it back together.
8.) its time to put the muffler back in. put the new gasket in and bolt the muffler back on. then re attach the exhaust hangers.
9.) turn teh car on and enjoy (if you are inside it sounds really cool to rev it up)

notes:
you can do this mod with a smaller pipe if ou do not want the 3" tip. it will not be as loud and you will not lose as much back pressure. with a stock sized (2.25" i think) pipe through it you will have very quite exhaust but you will have the mote noticeable gain in power. with 3" it is similar to before you did the exhaust but no you have acool sound.

When you put inthe straight pipe you will be able to hear exhaust pulses while you are driving at a constant RPM. i have noticed them to be the loudest at around 3k. its kinda neat to hear those.

sound wise it will give you a nice rumble at low rpms and a loud low growl at higher rpms.

becuase you are using the stock muffler even with a 3" tip it will still look roughly stock.

when paired with an intake or cone filter it will get louder at around 3k.

the exuast sounds different under load then it does at idle (it sounds better)

good luck, have fun.
if you have any questions just post or email me yornitram@aol.com

 

Good job with your muffler mod. Do you have any pics?

Thanks!

Jay

 

How is this so when the only thing you can see is the tip (unless you're under the car)? And the stock size is 1.75"

You realize when you do this, you still have the stock 1.75" piping, and your flow will still be restricted. It would sound like sphinchter-less, high-pressure diarrea, IMHO.

Wait a second... I fell for it. This is just a big joke, right?