I have done some searching and I can't find what I am looking for..so here I am. I recently installed a TT FCR 39 on my 08 Suzuki DRZ-SM. I followed the install instructions to a t and the bike is running much better but it still feels a little flat performance wise. It is also requiring a bit more throttle input when climbing even small incline on the highway to maintain a steady speed. Riding/Jetting conditions are as follows: 600ft elevation,aftermarket pipe with open muffler, and e base gasket - 160 main jet 200 main air jet EMN needle clip 3 45 pilot jet removed pilot air jet EFS 2.25 turns out Merge Racing AP spring I have adjusted the AP timing so there is no bog at all. The bike idles fine however I have noticed a slight RPM hang when rolling to a stop. The idle might hang for 3-4 seconds at a slightly elevated RPM before settling into the 1500-1700 range. I am getting a machine gun pop on decel in the higher RPMs and there is the flat response in the mid to upper range. I pulled the air cover door and that resulted in plenty of power to lift the front tire in second without the clutch and the upper range has more perceived power. I say that only because I don't have access to a dyno or any other real way to test at this time. However, the butt-dyno does sense a positive difference. Would it be advantageous to rejet to maybe a 158 main jet or to mod the airbox cover to allow more air in? Thanks!