CAMARO6 - View Single Post

laynlo15 · 11-07-2019, 03:12 PM

We usually see about 1.5 to 2.5 lose of boost with long tubes and no cats. But since you already have no cats I'd say about 1.5 to 2 on the headers, if you lower the compression a little less also. We also see about 1.5 to 2 psi for every 1/4 inch of smaller pulley change and that's about what I've seen on my changes also. With Meth and Ms109 you'll also be able to run more timing. I run about 25 degrees with no issues on my Manley forged motor and it takes less of a fuel system to run VP/Meth compared to E85.

11-07-2019, 03:12 PM	#4
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,882	We usually see about 1.5 to 2.5 lose of boost with long tubes and no cats. But since you already have no cats I'd say about 1.5 to 2 on the headers, if you lower the compression a little less also. We also see about 1.5 to 2 psi for every 1/4 inch of smaller pulley change and that's about what I've seen on my changes also. With Meth and Ms109 you'll also be able to run more timing. I run about 25 degrees with no issues on my Manley forged motor and it takes less of a fuel system to run VP/Meth compared to E85.