Actually the matching is a proccess by which the piston and sleeve are selected for mechanical tolerances and eliminating manufacturing defects even further. This will aid in break in and also retain a higher compresion ratio once that process is completed. The difference should be no higher than $75.00 US for this. Is it alot...yes. But it is worth it.

If you are purhasing this for your Max engine, please contact me at [email protected] and I will direct you to a reputable dealer in your area.

If this is for your Novarossi then just get the standard Piston and Sleeve.

Cheers,

John Rabbito