Hey all, it's been awhile, busy with an addition on my house. I was wondering if anyone has a seller/part # of a stiifer spring for the TBI FPR. I have the VAFPR, currently maxed at like 25-26 psi, BBC TB 90 pph's, would like to get close to 30, I already have a shim in the spring to get it that high. I searched and saw other post about getting a stiffer spring, but from where?? Thanx.