I have been doing some research on exhausts, and based on the dimensions of the exhaust port, the maximum tail pipe inside diameter should be 16mm. My stock exhaust only has 8mm, so I drilled a 10mm hole beside the existing tailpipe and inserted a 3/4in. male brass coupling. The coupling is held together by some exhaust glue I bought from a Hardware store. It now performs very well, lots of torque, but does not really increase RPM. Four stroking is minimized if not eliminated. I'm using a shift kit with a Shimano Alfine, and continues to climb hills even in 8th gear.
I did rebore the male coupling with an 8mm drill bit to get the right size. The noise has not increased subtantially and is still within tolerable levels. I can't seem to remove the end cap of the muffler, so I guess this is the best that I could do. More gases do flow from the 2nd tail pipe. The stock muffler does not have a cat. This is the one that has single bolt in the middle of the end cap.
Still saving up for a tuned pipe, so this is probably the next best thing...
Has anybody else tried this?
I did rebore the male coupling with an 8mm drill bit to get the right size. The noise has not increased subtantially and is still within tolerable levels. I can't seem to remove the end cap of the muffler, so I guess this is the best that I could do. More gases do flow from the 2nd tail pipe. The stock muffler does not have a cat. This is the one that has single bolt in the middle of the end cap.
Still saving up for a tuned pipe, so this is probably the next best thing...
Has anybody else tried this?
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