I am not going to get into this debate again with golden... This has been argued before in the past.. A few weeks later a member bought an Akrapovic 4-2-1 same as I am running, He ran it on the dyno and then had his ECU tuned and there was ONLY A 2% gain in HP and the AFR was NOT off before the Dyno tune mapping. Akrapovic is the ONLY I repeat ONLY aftermarket exhaust manufacture that states fuel modification is NOT needed with there exhaust systems.
I have been told by others that "You will burn a valve" You will run lean / rich BLAH BLAH BLAH BLAH! My azz over 20,0000 miles of hard riding, many passes down the dragstrip, topped out bouncing the rev limiter in 6th my engine is just as stout as it was. Idles, smooth and pulls like a grape rape WOT through the complete RPM range.
I am 40 years old and been working on engines for 30+ years I have owned many motorcycles over the years and installed many different kinds of aftermarket exhaust systems and YES I have always had to tune my fueling to get the engine AFR correct.
Akrapovic World Class Top Qaulity with some very expierenced engineers, they didnt cut any corners in the R&D area and the qaulity is in a leauge of there own. My exhaust still looks like it came out of the box from day one.
Ya want power? You dont want to have to tune and spend hours on the dyno to match a Brocks? Buy the one and only Akrapovic if you can afford the spend the extra money, its worth it..
I am done...
Ohh by the way I will help you get rid of the popping ..... Ignore the others and keywords use...
HAYABUSA MARBLE MOD you will find many detailed web links.
The exhaust systems are designed to function properly using the stock carburetor or electronic fuel injection set-ups. This means that no changes to the stock set-ups are necessary in order to use Akrapovic exhaust systems. Also, all of the performance specifications which we measure and list for each exhaust system model are based on stock set-ups. We assume full responsibility for the accuracy of these specifications. However, we also believe that it is possible to improve the original set-ups when our exhaust systems are used.
Of course, the market for tuning kits is extremely large, covering practically every motorcycle component. Tuning of the exhaust system includes the carburetor and EFI settings in addition to aftermarket components. There is a huge demand for this particular combination.
If you decide to rejet your bike in addition to purchasing an Akrapovic exhaust system, we recommend that you check out the range of products offered by the American company Dynojet. They have achieved excellent results with their carburetor and EFI jet kits, which they test themselves and which are specifically tuned for Akrapovic exhaust systems. However, they only cover certain parts of our range, so it’s best to make sure that Dynojet has a kit for your motorcycle and the Akrapovic exhaust system of your choice.
NOTE:
The Akrapovic company assumes no responsibility for the performance specifications given by the Dynojet company or any other tuning company for their products!
We guarantee only the accuracy of the performance characteristics given for Akrapovic exhaust systems, which are based on the motorcycles’ stock engine set-ups, and which are officially issued by the Akrapovic company.
IMPORTANT:
Tuning of electronic fuel injection systems requires precision and care, since unlike carburetors there are many possible settings which could exceed the useful limit for the engine! This could eventually lead to decreased engine performance, i.e. damage to the engine. We assume no responsibility for the proper operation of Akrapovic exhaust systems in the case of rejetting the carburetor or EFI system. (We suggest that you start tuning using the presets given by the manufacturer).
Never change the exhaust system and the jet's or EFI mapping at the same time.
First replace the exhaust system, then the other items. Even when replacing the stock air filter with a modified filter, rejetting/remapping has to be performed.
