[SupraWood]

I agree with BLKMGK. I had a 3-row on my stock twins and loved it, but when I got a single I moved up to the 4-row due to better piping. FWIW I live about a mile above sea level so I was really spinning the crap out of the turbos.

Daniel

 

[SupraWood]

why is the 4 row piping better can the three row piping not be changed?

The 4-row routs the pipes under the fender and then up to the turbo. This works very well for single turbos. The three routs it up throught the fender like stock. The only real negative about this is it typically requires a sharp bend at the compressor outlet. The two cores are similar but the 3-row has about a 20degree bend in the passenger side. This makes fitting 4-row piping on it difficult....if you can find a set.

Daniel