My experience with eBay cooler vs precision cooler was similar power but more consistent temps. eBay cooler kept claiming on consecutive runs on the dyno and precision cooler very stable temps
I can't remember whet the hose cost. As its my daily I have 3 kids to cart around so I didn't want any fuel smell so Teflon in the boot and series 400 outside the boot
I had a 34 box built by mv and for the price it's not worth the trouble of doing it yourself as there is no manual valve bodies available off the shelf all custom made
I had a gtx3076 with internal .82 on a 25 running 20psi. That's as low as it would go before it would creep. Now on a 2530 and needed to go external gate to keep it under control