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There are minimal performance gains if any, its all for sound.
You can do it yourself in about 15 mins with 2 wrenches and a sawsall.
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www.nybmwcca.org
Current Cars:
1995 M3 Coupe Manual Alpine White
1997 M3 Sedan Auto Cosmo Black Metallic
2018 x3 m40 Auto Grey Metallic
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