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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 08-05-2004, 12:41 PM   #1 (permalink)
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im gonna buy i new muffler for my bimmer do you think a single 3 in. inlet will be big enough for the dual 2.5 in. comeing from the car .

i was looking at a muffler that has a single 3in. inlet and a dual 2.5 in. outlet
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Old 08-05-2004, 02:42 PM   #2 (permalink)
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if thats ur M then its fine, but is the the 4cyl model? cuz the cubic inchs r small if it is u shuld mayb go 4 a 2.25 to a 2.5/3...its wat imma get on my 91' 318is
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Old 08-05-2004, 03:21 PM   #3 (permalink)
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Slvr E30iS... please stop your illiterate talk.

First thats not a M. Its a 325. As for the rest of your sentence i dont even know what your trying to say.

Taakaco. Flowmaster has what your looking for, im not sure if thats the sound you would want though. I have been trying to acquire a flowmaster for my car for quite somet ime but i just dont have the cash.
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Old 08-05-2004, 03:28 PM   #4 (permalink)
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Damn, you really do have a problem with me talking in abriviation? BTW its a "1988 320i euro spec" ok and who the hell cares, flowmaster is good though...take it easy Fox...
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Old 08-05-2004, 04:02 PM   #5 (permalink)
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Damn, you really do have a problem with me talking in abriviation? BTW its a "1988 320i euro spec" ok and who the hell cares, flowmaster is good though...take it easy Fox...
Its not that we have a problem its just that for communication purposes it is easier to understand wat u are saying.
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Old 08-05-2004, 04:13 PM   #6 (permalink)
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fox is right... wtf did u say? lol it makes NO SENCE and he dosnt have an "M"....

yo tak, there is this one dude on r3v that put a single in /double out on his 325I and it works fine.. he had a Y adapter put in from the cat i belive... im not sure why u would want to do this, and if it decreases your power in anyway i wouldnt do it. Have u ever looked into IE or supersprint by any chance?
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Old 08-05-2004, 04:34 PM   #7 (permalink)
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alrighty fellas ill talk more clear for u doods.
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Old 08-05-2004, 08:19 PM   #8 (permalink)
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Dont want to offend anyone but truly flow master is total garbage, if you have ever seen the inside of a flow master exhaust you would agree too. Flowmaster is more so designed to make a sound then it is for performance. If you want the most free flowing exhaust go with magnaflow. There are many good exhaust companys but flowmaster is the worst one. please trust me.
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Old 08-05-2004, 08:24 PM   #9 (permalink)
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i uhh ment to say magnaflow...lol get a dinan exhaust or an ac shnitzer
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Old 08-06-2004, 01:21 AM   #10 (permalink)
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Actually, you misunderstand. Flowmaster is a great muffler. Infact they are designed to increase horsepower greatly. Now what you are seeing inside is baffles, which you are correct, are for sound modification, other than that the exhaust is pretty empty which can be misleading. Flowmasters are designed for huge 350 (5.7 liter) engines which have a huge output from each exhaust pulse. these baffles make the air bounce around before they exit. Also they use inlet and outlet sizes of about 2.5 - 3 inches. Now you may say, wow thats big but on a 350 or 454 that actually can be pretty restrictive which keeps the torque up too.

Not to smash your dreams but thats the story.
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Old 08-06-2004, 01:35 AM   #11 (permalink)
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Flowmasters suck. For those of you that havent seen the inside of one there are a bunch of 90 and 45deg bends/baffles in them which is not good for flow. I would go with a SpinTech. I started using their mufflers 2 years ago and won't put any other brand on my cars. My 320i has a single 2"inlet/outlet SpinTech and my 325i has dual 2 1/2" inlets and a single 3" outlet. Anytime someone rides in my cars they always tell me my exhaust sounds nice and they want to know what muffler I have.

SpinTech on my '89 325i
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Old 08-06-2004, 01:44 AM   #12 (permalink)
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u wana help me with some exhaust Q's...
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Old 08-06-2004, 04:31 PM   #13 (permalink)
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I have a vibrant performance muffler and anyone that rides with me says they have brain damage
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Old 08-06-2004, 08:03 PM   #14 (permalink)
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lol thats a positive! haha nice touch
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Old 08-13-2004, 11:39 AM   #15 (permalink)
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sorry i didnt get back sooner but yes my car is just a "88 320i (car came the M badge(but hasbeen removed)) and one guy said he coulnt afford flowmaster , go to truckperformance.com they have the Delta 50 series for under $100

i had a flowmaster on my old car and it sounded great and i could feel the increase in power,
my only thing is i need to get a dual 2.5 in to single 3 in made for the inlet, all i was asking was is the 3 in gonna be large enough , or am i adding back pressure?
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