Originally Posted by R4N S S
I had a -18 on my 3dr when i bought it. Looks identical to a -31 too. HAd no problems running 28psi through it but the lowest we could get it to run was 18psi
I have it sitting in my garage as I changed it when I changed the turbo.
-18 will be no good for the rs then don't want to run that much boost on a nearly standard engine