Still a work in progress but I got them on. My seat of the pants gauge says I did not loose any power, in fact I gained a lot of speed of the line and top end is just silly now. That said I did a lot of mods all at once. I went from bone stock to the following. Black Widow Headers 4-2, Dual Yosh Exhaust Cans, Pair Valve Delate with Brocks plates, Sprint P-08 Filter, and More Mafia ECU Flash. I also have the full Woolich setup and I am in the process of data logging my bike performance with the Wideband O2 sensor. Chris Moore will then be fine tuning my bike for this setup which is really the best of the best you can ask for. That said with just his base tune loaded so far its impressive.
Some other notes:
Install was fairly easy for the average hobbyist like myself. Getting the midpipe on the left side to not touch the oil pan was a real pain and and first I had a lot of exhaust leaks which are now all gone by making adjustments and using sealant to be safe. The overall quality is really nice and I'll give fitment an 8 of 10 being that left side was a real hassle to get correct, all mounting points were prefect though and my Yosh slip on bolted on without any hassles. I did remove the radiator and while at it flushed the coolant. That was really easy, not need to remove the oil coiler. I also replaced the stock header gaskets with new copper factory suzuki gaskets, I also replaced all 8 header bolts because the factory ones were slightly bent from the factory. I torqued the new ones down to 17-20 lbs, my wrench is not all the accurate. I removed the 2 O2 sensors and replaced with SS caps once the flash was installed. Once I am done data logging via the wideband ill cap that bung as well. I would also had at least 2-3 bottles of coolant on hand if draining the radiator, i used 2 full bottles and a splash from an old 3rd.
The sound the bike makes now is what I would classify and deeper and different. Its got its own characteristic that is more baritone in nature, not high pitch or ricey by any means. At full throttle it sounds pretty mean and does not drone or come off to load, I actually kind of wish the overall sound was a tad bit louder. When using the quick shifter the bike now makes this really really awesome split second back fire explosion sound that reminds me of a BMW M3 or M4, sounds really sick.
But again my overall setup is now much much quicker than stock all around. Bone stock I felt the bike was meh, somewhat fast, but no where near as quick as my GSXR 1000, at least not until you compare 80mph roll-ons to 150+ where it shines. Now my busa feels much much closer to my GSXR in terms of low speed pull. From 5500 - 8000 RPM this bike is now a beast, you can roll on the throttle and its just goes begging for more. So to those who claim they lost low end power I offer they may have had a bad tune to go with it, and or some serious exhaust leaks.
I for one am keeping mine and I am very happy with it thus far.
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