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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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post #1 of 2 (permalink) Old 12-08-2003, 07:26 AM Thread Starter
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Well I installed the straight pipes yesterday and woooo boy. LoL does it ever change the sound. Since the pipes are now totally seperated without the converging muffler, you can hear the gurgling that is a trait of dual exhaust 8 cylinders. (its the cylinders firing at different times) Hrmm to sum up the sound.


Its not really that bad, but its a huge step from the quiet muffler of the 325is. At idle it sounds good. At 2000 its ok. From 2.5k - 4k oh man its killer. Sounds like some e30 m3 straight off the munich race tracks. 5-6k doesnt sound that good i think, perhaps it gets a little ricey sounding up there. When you let off the throttle it goes quiet and then not pops, but ... i dunno how to explain. Sounds like a bubble in the exhaust... Im sure everyone has heard and knows what im talking about.

Performance synopsis = I lost overall power. No other way to put it. Im using more gas to keep the same higher speeds. The m20 engine deffinately needs more backpressure than the catylitic convertor alone. However in the 2.5-4k range i did pick up a little power and then it dies back down around 5k from the non-goodly flowing sohc head.

Im gonna see if I can post some pictures and soundclips tommarow. ( i have a huge report to write now)

<span style='font-family:Geneva'><span style='font-size:14pt;line-height:100%'><span style='color:red'>Fox</span></span> <span style='color:gray'>the Pirate</span>
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I live my life one quarter mile at a time, and for those 23 or more seconds I'm free.
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post #2 of 2 (permalink) Old 12-08-2003, 11:38 AM
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lol sound clips please!

Three rocker arms later and I still haven't learned my lesson!
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