Andy,
4-1 is only for 4 cylinder bikes. Since you said Twin you'll have a 2-2 option or 2-1 option. Normally 2-1 headers make a bit more torque and power. The only companies I can think that may still make new exhausts for your bike are Jardine or MAC.
Later, Doug
1978 z1000 Streetfighter
1976 z900 Stripfighter
1979 z650 Resto-Mod
1983 Gpz750 Resto-Mod
2018 Z900RS
Last edit: 20 Mar 2015 14:24 by StreetfighterKz.
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