single or duals. what's better?
On a twin a two into two exhaust is designed for top end power, while a two into one is for mid-range.
A stock EX500 exhaust is a hybrid, a two into two with a cross over pipe.
The idea with a two into one, or a cross over pipe is to reflect the "pulse" from the exhaust of one cylinder into the other cylinder, to increase the flow of intake gases during the valve overlap.
Which is better? Two into one for the street, a "true" two into two for the track.
"Honestly, i wouldn't bother with the search for horsepower on this bike. It's an uphill struggle. the benefit of getting any aftermarket pipe on this bike is the added midrange power, not overall power. Edgar has a Dyno on his website of the Sarachu's with a K&N filter (not that the filter would make that much of a difference anyway) so that's 1/2 of the answer...."
The biggest benefit of an aftermarket pipe is the weight saving, the next biggest benefit is REAL horsepower increase, assuming you tune the bike to the changes made.
The biggest benefit to a K&N (UNI) filter is it is reuseable. On a EX500, the OEM filter is slightly restrictive, so there is a real horsepower increase with a free-er flowing filter, again assuming you tune the machine for the changes made. The down side is that K&N filters are only good at filtering fist sized rocks and low flying birds.
The reason Edger put a K&N filter on the bike that he ran dyno #s on, was in an effort to "Balance" the system. There is no sense bragging about how good your pipes flow...when you are choking the bike with an OEM filter.
New site...old BS.