I mounted a Peterson 3 gallon tank behind my passenger seat (which could easily be put in the trunk) for my LS7 setup. While the lines were long it did well.
https://www.speedwaymotors.com/Peter...iABEgIrRPD_BwE
You are aware that the factory LS7 dry sump system is subpar and needs quite a few upgrades to perform better? Mine when road raced would hold pressure from about 5000-7000rpm and not gain any. Meaning it would be about 55psi from 5-7K rpm. After much research the stock LS7 oil pump cover can deflect allowing oil to bypass the pump and not increase in pressure as RPMs go up. That is why there are billet cover style pumps out. In addition ARE and others offer an additional external pump plus different style oil pan to make the oiling system really work. I sold my stock LS7 engine pretty much due to this as it was going to be $3K to redo my oiling setup.
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Project: 1969 Chevelle, alum 5.3, GTS76 turbo, Chiseled Perf A/W intercooler, Holley Dominator EFI, Davis TC, JRi coilovers, 14" brakes, T56 Magnum. CTS-V Recaro seats!
Coffey Fabrication Nashville, TN doing the fabwork! 800rwhp+/25mpg+/9's@150mph goal
https://lateral-g.net/forums/showthread.php4?t=52976
1993 Mazda FD RX-7, built LS7, T56 Magnum, Holley HP, Davis Tech TC, 8.8" 3.73 Cobra IRS diff, DSS axles, Ohlins coilovers, big brakes.
CCW 18x11 front 315/30/18's and 18x12.5 rear on 335/30/18 RA1's,
2850lbs
10.31@137mph 165mph Shift-Sector 1/2 mile speed
441ci AllPro headed motor and 200lb weigh reduction in the works....