Bike Engines

I want to know if I can still have your bike customized from a superbike engine using custom exhaust, as I want to build my own chopper ..

I build choppers with 4 engines online all the time, I used to always use a 4 in 1 pipe I just ReBend and remove half of the chicane

If you mean the sound of a Harley? then no. very different type of engine.

when you say you mean Superbike brand that uses the venerable CG125 single engine capacity of 125 150 & 200cc?
If this is the case, then you are seriously barking up the wrong tree. You're not going to be like that its EHV engine type

If you want to say, "I can do a cross-line 4-cylinder as its V-twin?" The answer is "No".

different engine configurations generate sounds different and unique. If you want the sound of a V-twin, then you'll need a V-Twin engine.

A Japanese online with four pipes to measure is simply a harsh growl.

Yes, you probably can, but who would?

I think you must be someone very young. You must examine your own motivations, objectives, depth of commitment and degree of mechanical knowledge before embarking on this project.

It would be unrealistic to expect a superbike engine to make agriculture "potato potato" sound so often associated with Harley Davidson. It would be embarrassing. Superbike engines are designed for the 21st century, and are quite different.