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Old 07-12-2002, 04:43 AM   #1
Kostamojen
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Question Anyone running a custom midpipe with a stock muffler?

I'm gonna try and have a custom midpipe made for my car (about 2" in diamater) so I can have the WRX muffler Ive had sitting in my attic put on the car (instead of re-welding it) as well as improve the catback flow (my 1.8 midpipe is like 1.45 in diameter or something dinkier than the 2.5 stock midpipe or so)...

Anyone have something like this? Im thinking about not having a reasonator, but im wondering how it will sound with the stock mufler... Too loud, or not loud at all? I have no clue I just figure it would cost more for the resonator so I wont do it...
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Old 07-12-2002, 05:53 AM   #2
tonytiger
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I'm in the similar situation. Firstly I'm trying to replace the stock muffler with a better flowing. I'm trying to get those damn rusty bolts off from my heat shields and pipe connection without breaking anything. I'll have to break the bolts somehow and replace them.

I have asked people about removing the resonator. It shouldn't add nearly as much noise as it does with cars without cats, specially when comparing to Subies which has got two converters.

A friend mine has got a Escort which is old enough not to have cats. He removed just about every angle of the pipe and resonator and hit enourmous group N (the group is somewhat similar to WRC) muffler at the back. That thing was loud

But in our case, I doubt the noise will be add annoyingly - doesn't the WRX muffler be quite quiet by itself already?

Custom midpipe wouldn't be bad idea at all, since the exhaust gas is still somewhat hot at that section of the exhaust system and at least in my Subie the benbs aren't mandrel bent.



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Old 07-12-2002, 09:00 AM   #3
fellfrosch7
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That's what I had done for my STi type RA muffler, just a non-resonated 2.25" midpipe. Cost about $100, flanged on both sides, and installed. It's very quiet, doesn't drone at all, but still has that nice rumble and gurgling.
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Old 07-12-2002, 09:44 AM   #4
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Doubt it will be loud with a stock WRX muffler. Those things are pretty quiet. At least I think they're quiet, I've got a 2.25" piped, medium sound Brullen. That's rumbly!

What's the inner pipe diameter on the axle side of a stock WRX muffler? Might be fairly restrictive, but better than a 1.8L system. The inner diameter on my stock TS system was about 1.75".. Ack!

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Old 07-13-2002, 12:38 AM   #5
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Tony:

I had a heat shield that was rattling and tried clamping, etc...but ended up just taking it off. Its easy b/c the shields are just sheet metal. Just use a set of pliers and grap to the side of the bolts and bend up and down till the metal breaks...repeat for other side. If the bolts are rusted then most likely they won't come off unless cut with a torch. Just an idea to save you some hassel.


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Old 07-13-2002, 01:54 AM   #6
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My EJ18 headers end in only like a 1.25" diameter or something like that... It was 1/4 inch smaller than the EJ25 headers, and my midpipe is like 1.5 or less
I know that cause right now I am running a RS muffler on the stock midpipe/headers, and its alot bigger at the flange... But the WRX muffler is freakin huge in comparison

So ya, im gonna get that 2" midpipe... everyone says 2" is best for the 1.8, and since the WRX is like 2.1" the exhaust will flow good since its getting bigger and bigger instead of bigger then smaller again if you get what I'm saying...
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Old 07-13-2002, 04:08 AM   #7
tonytiger
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Slack: Thank you for your thoughts. However I've considered the solution you proposed and decided not to rip it off. This because in my case:

The heat shield is the same one which is connected to the second cat. The bolts of the shield therefore is connected to the cat - it's lower and upper heat shield. As you can guess the bolts connecting the cat's shields are also rusted - I'd have to break both of them as well.

Sometimes I tend to hit my Subie's bottom to the road when going to summerholiday cabin, the lower heat shield of the second cat is pretty scrached. The lower heat shield is a good armor for my converter.

One thing if nothing else doesn't seem to work is to cut those heat shields a bit and weld some tin plate to them.



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Old 07-15-2002, 02:45 AM   #8
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Heres a pic of my dinky midpipe! (thats an RS muffler way down there BTW)
Attached Images
File Type: jpg ej18exhaust.jpg (42.2 KB, 91 views)
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Old 07-15-2002, 05:57 PM   #9
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And... heres the new midpipe :
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File Type: jpg newmidpipe.jpg (31.6 KB, 1530 views)
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Old 07-15-2002, 06:10 PM   #10
Kostamojen
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Looks great! Sounds just right too... Its no stromung, and its hard to hear over my intake, but its there... And ya, I noticed the little whistle once and awhile, along with a little bit of backfire

But the biggest thing I noticed was the small HP gain... It loosened up my exhaust just enough so that the car is much smoother and revs a little faster as well.
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Old 07-15-2002, 06:11 PM   #11
Kostamojen
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Oh, heres a pic:
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File Type: jpg rearviewexhaust2.jpg (39.0 KB, 1546 views)
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Old 07-15-2002, 07:04 PM   #12
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Fancy exhaust or not...it's great to see that guy on the road again!

NC
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Old 07-16-2002, 01:39 AM   #13
Kostamojen
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Quote:
Originally posted by dcrawford
Fancy exhaust or not...it's great to see that guy on the road again!

NC
Oh you better believe it!

Ive never wanted to just "go out and drive" all the time like I do now... I missed the car that much
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