I've taken the plunge on one because of the usual nightmare getting to the air-filter to replace (rusted screws barely accessible and tiny etc) I do motorbike trackdays and have had two instances of circa 15BHP gains over stock just by fitting a K&N performance filter and having the fueling tweaked on a dyno (carbed engines), so thats proven gain on Dyno down to better breathing.
So I took the tales of gloom on various forums about 57i kits with a pinch of salt and fitted one today. A few observations: -
1. The accompanying instructions arent worth the paper there written on.
2. Its truly a nightmare manouvering the air box and resonator box (that dont seem to split in-situ easily) out of the engine bay.
3. That aside, fitting the kit after that is easy.
4. It leaves existing intake pipe in place and connects a new length of intake pipe off the MAF, which in stock form connects directly onto airbox on a JTS, thus the filter (with a neat bag that goes over it) sits right where the resonator sat on bottom left air duct on bumper.
On that basis looks to me like there is effectively no change in the length of intake run and as the filter cone sits where the resonator intake aperture was I dont see much additional risk of water ingress, in fact thats what the bag is designed to minimise (water repellent) or any new issue of heated intake air.
As to performance, always subjective unless you dyno, but for sure a very noticeable sharpness of acceleration right through the rev range and, goes readily all way to red-line in every gear. In the end, if it follows the experience with my bikes, 10-15 bhp for £87 is a no-brainer....then Get a re-map for £150 then a 2.0 JTS could be at the thick-end of 200bhp for less than £250 and no hardware mod. Now thats not to be sniffed at
All in all I can heartily recommend the 57i induction kit
Last edited by yamaha1200; 17-02-12 at 14:11.
Reason: duplicate post