How to know whether its an ori r?

[gotboost33]

Bro...Is there anystuff i can check on the car to know its an ori spec-r or convert one?....TQ

 

[alray]

The Spec-R differed from previous Silvia models by featuring a 6-speed manual transmission. The Spec-R also included extensive chassis and suspension strengthening via the use of larger anti-roll bars and strut bracing. The S15 featured the same 4-piston front brake calipers that were found in the S14 but included a larger brake booster.
One of the biggest changes to the S15 model of the Silvia was the implementation of a helical limited slip differential. The result was a safer, more track suited drive; in some contrast to its drifting heritage and subsequent media attention.

As with many Nissans, HICAS (High Capacity Active Steering) four wheel steering was available as an option.

 

[lan evo]

check the chasis tag

spec r manual GBYARU YS15UD4C--A-
auto GBYARU AS15UD4C--A-

more info here
S15 Specs

 

[gotboost33]

Bro alray. All you mention can be convert just by buying a full cut. Thanks bro lan evo. So that means the chassis tag is different.