Silver Bullet Posted June 9, 2008 Share #1 Posted June 9, 2008 can anyone tell me if modifying the air boxes on the 2nd gin will help it breathe a little better?? and how is it done?and will it hurt the bike? a lot of questions,but if there is a way to help the bike I would like to do it.but if it dosen't help ,there is no reason to do it.:confused24: jack Link to comment Share on other sites More sharing options...
yamahamer Posted June 9, 2008 Share #2 Posted June 9, 2008 I TOOK THE DEFLECTERS OFF THE FRONT OF MINE JUST TO GIVE IT A BIGGER HOLE TO BREATH WITH THE K&N's SOOM IMPROVEMENT BUT NO SIDE EFECTS. I MEET SOMEONE AT A MEET AND EAT THAT TOOK THE BOX's OFF AND PUT ROUND FILTERS ON AND SAID HE HADE NO PROBLEMS. I THINK AS LONG AS YOU DON'T CHANGE THE HEADERS ON THESE BIKES YOUR OK. Link to comment Share on other sites More sharing options...
GeorgeS Posted June 9, 2008 Share #3 Posted June 9, 2008 I found that about 6, -- 1/2 inch ---diameter holes, is about right. If you go to much, it will decrese engine performance. To prove this, simply Remove the cover, and go for a short ride. Link to comment Share on other sites More sharing options...
slick Posted June 9, 2008 Share #4 Posted June 9, 2008 I can tell you that on my 07 RSTD I opened the holes up to about 4" and the bike fell on it's face in the lower RPM'S. This is just my experience. I have read a lot of people's claims have had no problem. maybe just my bad luck. I have BUB slip-on mufflers and K&N filters. no other Mod's. I had to make a plate to cover the large hole and put it back to stock. Good Luck. Link to comment Share on other sites More sharing options...
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