I have a 00 jdm itr with oem 4-1 header with a generic high-flow cat with old skool rs*r exhaust and a tune-up. what do you think my wheel horsepower would be? How much horsepower is the motor rated at? 210hp or 207hp or 200hp Ive heard all three.

 

Stock the engine puts out 200 claimed hp at the crank @8100 RPM's. I got this information from http://tech.hybridgarage.com/tech/bseries.html. As far as whp I'm not really sure. It really depends on your transmittion. I usually take off about 40 hp to come up with a rough idea of how much hp is lost in the tranny. You will never really know unless you dyno your car. Even then the dyno may never give you exact numbers.... Good Luck!

 

THe JDM ITR motors are 200hp. bseries.net has dyno graphs of a bunch of USDM Type Rs(195hp.) But the dyno of a STOCK JDM type R motor laid down 168.9 whp and 122.1 ft-lb ------VS. a '97 USDM type R motor=161.9 whp and 114.2 ft-lb. Difference of 7hp & 8ft-lb. That would confirm the +5-10hp of JDM motors. I guess you could add horsepower of what you think your mods are worth but otherwise you'll just have to hit the dyno up. Good Luck.