Hi Alex ,
This is a copy of a message i sent to the list some time ago , if it helps
Removed my collector box & down pipes 2 years ago ( including catalyser
inside )
Replaced with down pipes/collector box from yamaha thunder ace .
Cut threaded lug off old box for sensor and rewelded to new one .
Cut and rewelded outlet to muffler to line up correctly.
Welded plate on where valve used to go on collector ( thunder ace )
Lined up at head ok .
A lot less restrictive , more power , from 94bhp to 106 with filters ( K&N )
Bike runs ok , slight loss of bottom end power.
atb Nick T
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