It made good power but you are not using that blower for what its meant for. I am also betting at 18-19lbs your car doesn't hit hard as well. The gen 4 and gen 5 whipples, if you are going to be running low boost, they will not perform any better than the lower generations. The gen 4 and 5, the only way you are going to see any difference is if you run big boost. I spoke to a few guys that ran the first batch for whipple. crusher inlet 2.9's gen 4 and 5 you need to throw boost at them. 18 lbs, its like running a 88MM turbo on 15 lbs. I understand you have room to grow but if you are never going to run more boost, your car will not run how it should. 18lbs I would have bought a vmp. Hands down. Have that crazy low end and still make good power. Just my thoughts. Its your car.
I bought the 2.9 bc I knew it was going to be ran on race gas or e85. Nothing less than 22lbs.
I have the standard inlet 2.9. It doesn’t hit too hard in the lower end and I can tell but it is as smooth as can be to me lol. As for right now I am planning on keeping it at this power level until I am confident with the power. But once I am I do plan to go for more boost maybe 22lbs as I know these blowers do like a lot of boost. As far as 2.9s go I am satisfied with my gen 4.