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Old 12-04-2017, 01:03 PM
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gnx7 gnx7 is offline
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I ran (2) 3" Random Technology cats on my LS7 cam/headers RX-7 swap and it still went 110mph in the 1/8 and 138mph in the 1/4 on 91 octane. I would say a quality hi flow cat on an n/a setup eats maybe 5-10rwhp. I also hate the stinky unleaded smell without cats.

eBay cats can be found for $50 on up!
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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....
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