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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 01-20-2013, 12:12 PM   #1 (permalink)
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E30 M50 Exhaust fun

So i've got an e30 swapped m50. Going to the smog ref on tuesday and had a few questions about exhaust options. Eventually i'll be dropping in a s50 clone but currently just an m50 with m3 headers. Now when i dropped the car off at the exhaust shop i asked for true duals all the way back with 2 cats. When i pick up the car they put 2 1/2 inch duals all the way back with a x pipe b4 the cats and the o2 sensor in the cross pipe. Loud as all hell crazy amount of resonance. No low end power and sounds like a rice rocket above 3k rpms. WTF. So back to the drawing board and i need a somewhat quiet setup that doesn't kill the HP too much any suggestions?
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Old 01-22-2013, 01:16 PM   #2 (permalink)
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Passed the ref check with flying colors. Remember in cali u have to have 2a cars as well as a y pipe to single exhaust out the back. Woohoo
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Old 01-22-2013, 01:24 PM   #3 (permalink)
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E30 M50 Exhaust fun

Yeah Cali emission standards are much stricter than anywhere else in the US. 2 cats is mandatory


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