Modding a pre exhaust

[shibby]

Hi, i wondered if anyone have tried to drill out the inner part on the end of the exhaust can's on the stock exhaust? Is the sound any greater? Any negative effects on the engine?

Thinking of removing the part that i've outlined in red on the picture

[Black_peter]

OK you need to understand how the can works. Cutting out that section gives you an open pipe.. That smaller pipe goes through the length of the can, cur that out and you loose your baffles, packing everything.

[Kreylyn]

Sounds terrible but is alot louder... the more you remove, the more you expound upon both of those...

Unless you go extream, it won't nessasarily ruin your motor... but your performance is certainly going to go down.

Krey

[Philskat]

I took a 3/8 in rod around 12 in long ground a point to it and hammered it down through the center through 2 plates inside and to me it is allot better than stock and seemed to help the performance or at least the clutch thought so because it would not hold even in 5th

[akarob]

A lot of people seem to think that by just opening up the exhaust, their bike should have more power. The fact is, unless you rejet the carbs, your lean factory jetting just got leaner. Your bike will start worse and run hotter.

You would really only benefit from opening up the intake or exhaust if you rejet the carbs.

[flo239]

sounds a little tricky. good luck