Took my 99 400 apart over wekend and found minor vertical scratches on cylinder wall, exhaust side. Should I have a sleeve installed or should I just have the plating redone ( nikasil ? ) I heard that a cast iron sleeve may reduce performance. The scratching seems minor execpt for one which is about .015" wide by 3/16" long. I will install new pistin / rings and am considering a slightly higher compression ratio piston such a a Wiseco.( 13 : 1 ) Is there an advantage to this set-up and will it affect reliability? Thanks for your help!