Could you explain the difference between your IRS kit and the Velocity.

From what I gather, the IRS is basically a book chassis but incorporating IRS instead of live axle, and the Velocity is more based around the Sierra, i.e. wider track and taller engine bay.

Have I got that right?

Hi, the Velocity is an IRS with standard track, the GRP is re-engineered to take the Pinto etc and extra brackets are fitted for ease of build the Velocity has taken the place of the IRS.