What the folks over at Active Autowerkes have accomplished is to transform your existing BMW primary exhaust catalysts into a smaller, more compact unit that has added features. Just by cutting with a sawzall and welding by someone competent, you will have a re-sized BMW factory catalyst in a much smaller package. The Active Autowerke Stubbies is designed primarily as a cost effective means of utilizing your existing BMW Factory catalysts into something usable. Simply remove this front section and replace with the BMW primary catalysts that are converted with the Active Stubbies.
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