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timstar92404 · Joined: 22 Sep 2004 Posts: 2075 Location: richmond BC

I'm replacing my entire exhaust system with new parts from the engine to the muffler. I want to replace the exhaust manifold aswell with an aftermarket "header" I'm wondering where is the best place to order one. Also will the header attach to the oem downpipe?

this is kind of a dumb question but how would the rest of the exhaust attach to the downpipe if it doesn't have the same type of connection made to attache the downpipe

I'm going to add a catalytic convertor aswell both for emissions and lowering noise level.

last question can the EGR sytem, I think comes from the downpipe connection be bypassed? is this easy to do and would it have a big effect on emissions?
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78 924 sold.
85.5 944

5150 · Posted: Thu Mar 02, 2006 5:55 pm Post subject:

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

Tim, get it out of your head that a cat will reduce the noise level.
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

5150 · Posted: Thu Mar 02, 2006 6:31 pm Post subject:

timstar92404 · Joined: 22 Sep 2004 Posts: 2075 Location: richmond BC

timstar92404 · Joined: 22 Sep 2004 Posts: 2075 Location: richmond BC

I know you need a header made to fit the car that's obvious and the downpipe also has to fit. but does the stock downpipe fit to an aftermarket header?

and would you have to have special exhaust pipe connectors to attach the exhaust piping to the downpipe or would the muffler guy have the correct connectors.

I still think a cat is a good idea, it would make the exhaust much cleaner. Right now my car is probably putting out more pollution than a bus.
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78 924 sold.
85.5 944

timstar92404 · Joined: 22 Sep 2004 Posts: 2075 Location: richmond BC

unrelated question, today after class when I got in my car the shifter would not go into first or second gear, I had the clutch fully depressed and the car was running but I couldn't get the shiter to move into first or second but it went into third and forth and then it was fine again.... the shiter is always hard to push into gear it doesn't move smoothly.

should I be worried about this?
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78 924 sold.
85.5 944

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

timstar92404 · Joined: 22 Sep 2004 Posts: 2075 Location: richmond BC

thats what I thought, if the engine isn't running properly, mine isn't it'll just wreck the 400 dollar cat.... I thought any unburnt fuel getting on the cat will wreck it immediately.

Only header I have seen on the net is the msds I think they are 250 dollars but I'm not sure how much it would cost to ship to Canada.

my car has had the fuel mixture set twice..... once just a month ago according to the mechanic they ran the car on a gas analyser or whatever its called. Everyone still tells me the exhaust smells rich.
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78 924 sold.
85.5 944

5150 · Posted: Thu Mar 02, 2006 7:13 pm Post subject:

Why not just fit all the standard parts for your model, at least then you'll know they'll all bolt in correctly with no messing around?
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Mars Red '78 Euro 924 n/a
http://www.cardomain.com/id/5150_uk

Graphite? Grey Metallic '85 (late model) 944 2.5

There are two kinds of pedestrians: the quick and the dead.

timstar92404 · Joined: 22 Sep 2004 Posts: 2075 Location: richmond BC

what do you mean by standard parts? I'm going to use the oem downpipe, I want to replace the manifold and then the rest of the exhaust to the muffler.I thought the only parts that you would need are the header/ downpipe the rest the muffler shop can build for you, am I wrong?

right now my exhaust from the cat back is new so those could be reused.
_________________
78 924 sold.
85.5 944

5150 · Posted: Thu Mar 02, 2006 8:51 pm Post subject:

Dunno how things are done over there mate, but here I can buy all the sections pre-fabricated and just fit them straight to the car.

My UK '78 only has 4 parts - Manifold, downpipe, small centre silencer and then a long rear section with a small silencer then the main back-box.
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Mars Red '78 Euro 924 n/a
http://www.cardomain.com/id/5150_uk

Graphite? Grey Metallic '85 (late model) 944 2.5

There are two kinds of pedestrians: the quick and the dead.

timstar92404 · Joined: 22 Sep 2004 Posts: 2075 Location: richmond BC

I think a "silencer" or resonator would be a good idea to keep the noise down. I read that you ahve to remove the head to install the aftermarket headers that would cost alot in labour.

another question do you guys think it would be a waste of money if I install a rebuilt head on my engine, I'm thinking of doing this in the summer. It wouldn't be a bad idea with a high milliage engine right....

I have around 3000 dollars to waste I guess.... I want to use it all to do mechanical work on the car, I'm guessing exhaust with header, resonator, pipes and labour would cost 1000 more if I get a good cat.
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78 924 sold.
85.5 944

PORSCHEV · Posted: Thu Mar 02, 2006 10:31 pm Post subject:

Wow Tim....last week the car was for sale on ebay....today your rebuilding it. Are you on drugs?? Your like a woman trying to get ready for a night on the town....you change your mind like a woman changes outfits.

Answer this question....have you ever fixed the areas where you found carbon monoxide levels to be leaking in?

Now your going to change your entire exhaust.....and put on a cat to make it quiet. But your going to install a header that will make it louder!!

I don't know why I bother!!! Not a word will even sink in...lol
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1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.

1978-#53 "D" track racer.

timstar92404 · Joined: 22 Sep 2004 Posts: 2075 Location: richmond BC

I want to replace every part including the header so I know 100% that all the exhaust components are new and aren't going to start leaking soon after. right now there might be a leak somwhere that I can't find.

after that I'll get the rear hatch fixed so it seals up but I already sealed it up airtight with plsstic and still got CO reading in the car.

I said no to drugs but they wouldn't listen. Just kidding I don't do drugs.... well I used to smoke alot of pot but not anymore... Too busy with school now.
_________________
78 924 sold.
85.5 944