![]() The stock setup is a compromise with HP, Torque, fuel economy, and NOISE. Since most of us don't compete in superbike with our birds, We can change stuff around. If they wern't forced to, how many stock intake setups do you really think you'd see? They had some pretty exotic shit on the 750's. In AMA Superbike when they allowed the 1000cc 4's to compete, they REQUIRED them to run stock intake parts to equalize power production between them and the twins. The height "tunes" the throttle bodies: short=high RPM Horsepower, long=low RPM Torque. The smaller diameter would work better with a carbed bike, increasing air velocity to pick up fuel better, but a FI bike doesn't need this since the fuel is injected rather than sucked through jets. The smaller diameter stacks are a problem with Honda 929,954, and 1100's from what I have researched. On most GSXR's I've seen, the velocity stacks are the same size as the throttle bodies. ![]() However, in typical Honda form, it is very choked up They do this for many reasons, mainly noise compliance. The velocity stacks look to be 1-1.5mm smaller than the 42mm throttle bodies. The EDR Performance Honda VFR800 Gen 6 (2002-2013) Velocity stack kit is here We have many VFR800 customers and the 1 performance comment has always been 'I wish she had more top end' The VFR800 is one of the best all around bikes. What I don't get is why the velocity stacks are a smaller ID than the throttle bodies. The longer stacks are installed on the REAR cylinders and the shorter on fhte FRONT cylinders (aka front of airbox). You simply remove the oem stacks and their mounting screws. This kit replaces the 4 oem stacks, the kit includes 4 EDR Performance staggered velocity stacks. These kits do not contain instructions, they are intended for race technician installation. They are intended for race use, off-road competition use only. Onyx is chemical resistant and can tolerate temperatures of nearly 300*F! These stacks are of course not highway or road legal and may affect your warranty and or emissions requirement. The production stacks are produced with the highest quality Onyx + Carbon Fiber reinforcement on state of the art MarkForged 3D machines in house. The stacks do NOT require remapping, but we have found even better gains with proper mapping and this really smooths out the "hit" many riders feel when these V-tec engines in the 6,000-8,000 rpm range and the V-tec is in effect. Then, when you are wanting to play in the twisties, pass that buddy of yours with ease! These stacks design allow the rider to use ALL of the revs Honda put in the great V4 engine to redline! These stacks allow you to keep the great riding characteristics of the V4 engine and also get a bit deeper growl upon full throttle that everyone loves. ![]() The one thing we didn't want to do was lose any power! After several versions tested on our software and on the dyno, we finally found the perfect set up for keeping the oem power the same as stock below 9,000 rpm and yet were able to get up over 5 rwhp towards redline! Actually +10 rwhp on redline as the stock bike simply falls on its face above 9,500 rpm. We spent countless hours on the stack design for these engines as VFR owners are known to be very picky and have high expectations. However, in typical Honda form, it is very choked up! They do this for many reasons, mainly noise compliance. We have many VFR800 customers and the #1 performance comment has always been "I wish she had more top end!" The VFR800 is one of the best all around bikes. The EDR Performance Honda VFR800 Gen 6 (2002-2013) Velocity stack kit is here!
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