Pipes

[blackhawkxx]

Someone ask me this question and I have a carbed bike and thought you guys would be the best to answer:

Have not seen many people swapping over to a 4-1 system on the

bike--mostly slip ons. I'm guessing that's because Honda has a Closed Loop

analysis system on the FI bikes and there's no place available on

aftermarket pipes to incorporate the Oxygen sensor. Imagine this tends to

make the bike run "sour" when compared to the stock fuel ratio mixing. Am

I right about that??

However there was on the board a picture of the internals of the

stock exhauust showing not only the restrictions internally but also the

sharp bends the exhaust gases have to make on their way out. This

surely restricts performance of the bike in this stock condition. So what is

the cure for this dilemma?? Your carb'ed bike is different--but what

have you heard about the FI bikes. Does most everyone go with the slip

ons because of the lack of a 4-2 performance system or is it the O2

sensor deal that the exhaust manufactures don't want to address this issue??

Input, thoughts, knowledge please. It would be Very Helpful to get some

enlightenment on this area. The Hayabusa is an open loop system and you

can put on a performance exhaust and with Yoshimura's software remap

the complete fueling system from 0-14,000RPM. This would seem to be a

BIG advantage to me when searching for a big more "get up and go".

[demon]

My bike is a 99 model "49 state bike" and is Fuel Injected. Only California bikes get the oxygen sensor and I don't know of anyone who makes a full system with dual pipes. I have a 4-2-1 Akrapovic on mine and love it. Sometimes I wish I had slipons just for the looks of them. When I bought my bike used, it already had the exhaust on it. If it were stock, I would have probably went with the MIG's. The Suzuki's ECM is reprogramable with a Yoshimura box, unlike ours. We need a Powercommander to help out our fuel and ignition. My bike has no provision or wiring for an oxygen sensor, so I guess the bike runs in an "open loop" like a busa. I'm like you, the stock exhaust looks really restrictive to me in the collector area and where the pipes split into the dual pipes. Slipon mufflers can't help help this restriction out, but will help with a less restrive muffler. The biggest advantage to aftermarket slipons, I can figure, is the weight reduction and the improved looks of the cans. My exhaust header and collector area has NO restrictions. Straight flow into the collector and muffler.

[CBRXX]

On the '02 model year in the USA, only the CA models have the O2 sensor. Not sure about the '03 or other years. Of course, you could always have a bung welded onto any aftermarket exhaust to utilize the sensor.

Steve

[beltwaybob]

Mine's also a '99, no sensor. I put a Micron full system on (4 into 2 into 1). Dynoed it with a PC II at Fast Lane Cycles. It didn't show that much gain in hp or torque on the chart but I notice overall improvement, especially from about 4000 to 8000 rpm. I'm lazy, I don't often downshift. That's why I love the XX.

[blackhawkxx]

Thanks guys. I will pass on the information.

[Hrc4u]

i have a "european" bird version with the O2 sensor..

i recently bought a full Akra 4-1, and that system has a place

for the O2 sensor!