Headers/exhaust - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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#1 (permalink) Old 12-21-2004, 02:36 AM
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i am getting my supersprint headers and exhaust installed on thursday...

what kind of gains can i expect to get realisticly from this kind of setup?...

i am keeping the oem cat and i have the m44 1.9 liter engine...

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#2 (permalink) Old 12-21-2004, 02:40 AM
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Headers won't do much...maybe 8hp...exhaust maybe 5.

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#3 (permalink) Old 12-21-2004, 09:49 AM
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Just a friendly question.
Wouldn't you have checked on that before dropping the cash to buy it?

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#4 (permalink) Old 12-21-2004, 10:05 AM
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The SS headers are a waste of money. If you hadn't noticed, the BMW 318 motor already comes with a set of very nice flowing stainless steel exhaust manifolds. The 6 cyl models benefit more from an upgraded header as they use some nasty looking ceramic crap from the factory. It's funny how on the cheaper 318 motor, BMW decided to use better internals; forged crank, forged pistons, ss exhaust manifolds, cast aluminum intake manifold, aluminum valve cover. It's supposidely based on the BMW 850V12 motor's technology, BMW's most unreliable motor, yay!

Without any further modifications or proper tuning, you'll just feel a huge drop in low-mid ranged power. You'll gain some high end, but in the end your car will be slower. You need more internal engine modifications inorder to take advantage of the better flowing exhaust system. Oh and BTW, using an upgraded header with a stock cat is even more a waste. The whole point of a header is for better flow, the cat restricts the flow so the money spent on your header should have been better spent somewhere else. SS exhaust for the 318 is a nice choice though. No worries, if you plan on some internal modifications in the future, you made a good choice. Those are some quality headers, about 100,000 times better than Genie. Just find yourself a high flowing cat or hollow out the one you have.

Did you get the 4-2-1 or 4-1? Anyways, I hope you like revving

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#5 (permalink) Old 12-21-2004, 12:29 PM
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Quote:
Originally posted by mech9T8@Dec 21 2004, 09:49 AM
Just a friendly question.
Wouldn't you have checked on that before dropping the cash to buy it?
[snapback]255506[/snapback]

it aint all about how much hp and tq you get from something tat makes you buy it..

supersprint is an AWESOME company with great products...

i do plan on doing some major engine work .. such as the DA supercharger.. and this will only help me in the long run...


Quote:
Did you get the 4-2-1 or 4-1? Anyways, I hope you like revving
i ordered the 4-2-1 headrs...... did i make the right choice..?

i do like revving.. but what do u mean by tat?

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#6 (permalink) Old 12-21-2004, 12:31 PM
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Quote:
Originally posted by Autotechnica@Dec 21 2004, 10:05 AM
Just find yourself a high flowing cat or hollow out the one you have.



Bry
[snapback]255518[/snapback]
what would i do about passing emmision with a hollowed out cat or a high flow?

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#7 (permalink) Old 12-21-2004, 12:35 PM
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If you get a high flow one.. you can always just put your old one back in... go to the inspection.. then put the high flow back on... I know a lot of mustang guys who do that all the time...

Good Luck,

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#8 (permalink) Old 12-21-2004, 12:41 PM
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dude do a swap first it will cost u like 3 grand for the engine rebuild if u can get a core then install it and your car will be a lot faster



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#9 (permalink) Old 12-21-2004, 01:12 PM
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Quote:
Originally posted by buuhh99@Dec 21 2004, 12:41 PM
dude do a swap first it will cost u like 3 grand for the engine rebuild if u can get a core then install it and your car will be a lot faster
[snapback]255594[/snapback]
we have discussed this topic many times b4... the supercharger 318 is a very good performer... it is faster than a stock 6 cylinder... and furthermore.. the engine mounts for the 4 and 6 cylinders are different.. so your 3 grand figure is not correct... and for wat.. to increase the weight of my car???

think about it.. similar power... less weight..= good choice...

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#10 (permalink) Old 12-21-2004, 01:13 PM
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this cats are bolt on?? do take the old one out and put a new one in entails what exactally?? does anyone have the haines or chilton manul pages on this??


would this "high flow cat" be model specific to my m44 318 or would any old cat work??

does anyone have a suggestion to which company i should look into for cats?

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#11 (permalink) Old 12-21-2004, 03:17 PM
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Quote:
Originally posted by 97alpineM3@Dec 21 2004, 11:35 AM
If you get a high flow one.. you can always just put your old one back in... go to the inspection.. then put the high flow back on... I know a lot of mustang guys who do that all the time...

Good Luck,

Les
[snapback]255589[/snapback]

make sure you put the stock exhuato n a few months before your test though!

David
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#12 (permalink) Old 12-21-2004, 03:33 PM
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I love sport headers...... It looks cool and you even get more HP. The intake and exhaust system are the limiter of the engine, so good choice!

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#13 (permalink) Old 12-21-2004, 04:41 PM
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I have some m3 headers for my 325. Will they bolt on? And, will there be a performance gain?

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#14 (permalink) Old 09-15-2005, 07:49 PM
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i have a 95 318is and i was considering headers, i dont understand how they can restrict your engine even if you dont hollow out the cat. Catback exhausts do not make sense with out headers
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#15 (permalink) Old 09-17-2005, 01:23 AM
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To pass inspection buy a box of fresh donuts and a hundred in the passenger seat and then drop it off for inspection my friends supercharged v-8 convert excuse me v6 according to the gov't passes every year.
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