Main difference is that Collari is working exclusively with AAC p/s sets. The mods are not simply seen by eye inspection, so when you open them, they just look like a regular Evo 2 or WCR Sirio. The changes are in crank timing and polishing, and different port angles and timing, better quality bearings, plus his initials MC engraved on crank face. The other major improvement is the LC gravity cooling head, also that he has access to selected parts from Star Motors (Sirio and Collari manufacturer), which in all makes a blueprinted mod engine of great performance.

AFM