I just recieved my Aluminum Oval Leo Vivci slip-on for my F4 today and have just gotten some riding impressions.
This exhaust rocks!
It has eliminated the infamous flat spot in my F4's powerband at 5,500 RPMs. It pulls past 13,500 RPMs, and it has gained torque below 6,000 RPMs(this may only feel like this because of the eliminated flat spot) It pulls smooth through the entire RPM range. It has a very sweet exhaust note, throaty, but not abnoxiously loud(just right). I have done no jetting and will do it soon. I am at 6,000 ft. here in Colorado Springs and was told to jet 6% leaner. Anyone with more recommendations? I may be purchasing the header and an air filter later, so I will have to rejet again anyways.
My only complaint is that it has a slight exhaust leak where it clamps onto the header, but it goes away after idle. I think this is caused by it being made of stainless steel, thus it expands and contracts as the temperature rises and falls. The fit was really good with tight fittings throughout and the finish is top quality. The welds are honed out so the exhaust is smooth with no welds on the inside. I thought it would have been louder considering it is a straight through race can, but it is very reasonable.
The collector pipe has a bracket with a rubber stopper on it which I was informed by a rep. at Indigo that this is for the centerstand on the European version. At first I thought I got the wrong collector, but I was told it is the right one. This piece is not visible unless you are looking for it.
For the Leo Vinci SBK logo on the side you are supplied with an aluminized sticker and an aluminum plate that comes with rivets and a drill bit. I opted for the sticker because it can be replaced with the metal plate if anything goes wrong.
I would like to purchase a centerstand for my bike if the price is comparible to a swingarm stand. The frame already has mounting points for it, and it would allow me to service the swingarm and linkage, as a swingarm stand wouldn't. Some have said that I will lose ground clearance, ect. but the Europeans don't seem to have a problem with it. Does anyone know a price or where I could get a genuine Honda centerstand for my F4?