Underated dyno? You mean that it needs to be SERVICE and CALIBRATED?
Any ways, my car has been dynoed in several diferent dynos always displaying good numbers. By the way, just got the car re-dynoed over here in Germany yesterday, on another diferent dyno and it showed a nice 329RWHP, that was with NO COOL OFF just straigth from the road after a nice 1 hour drive (high speed driving).
And this dyno (Manufacture by TAT Dynos who supplies Wheel Dynos to Big manufactures like BMW and Porshe over here in Germany) is rated about 8 RWHP LESS than a similar DYNO JET (this is based on hundrets of side by side compartions runs in CONTROL ENVIROMENTS) due to thier loading mechanism (similar to a Mustang Dyno but not as radical change in numbers). So, with that in mind it confirms the gain of o/a 4-5 RWHP provided from the WMS CAI/Pro-M 95mm CAI over the DS/Pro-80mm CAI. So, if we take that 8 HP diference then we will be looking at 337RWHP????
But you are very correct, I may not put down those numbers on your shop.
Naz