30 psi on 98 octan pump gas. Above 30 psi the 35R is out of breath. I also got a Autometer fuel pressure gauge. Abit pricey' date=' but its a cheap insurance. The Pro-Maf togheter with a adj fpr allows me to set the AFR where I want it. My AFR is set at around 11.7 - 12.1 full boost. AN6 flows plenty. AND the Integrated tank keeps the 044 quite. I used to have the 044 mounted alone next to the fuel filter, and it was crazy loud. [/quote'] Thanks mate time to go pro maf and max the 35r out then its billet compressor wheel time lol.