In other words, will I see improved ETs with subframe connectors? Thanks.

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1984 Camaro Sport Coupe - Rebuilt 355 S/D TPI L98, Crane 2032 CompuCam, Crane adjustable fuel pressure regulator, MSD Blaster coil, custom burned PROM, stock TPI intake, Accel 24# injectors, gutted air box with K&N filters
F41 Suspension Package, 700R4 Tranny, TCI Breakaway torque converter, 3.27 Posi Rear
Hooker Shorty Headers, Catco High-Flow 3" Cat, Flowmaster 3" American Thunder Cat-Back

Best 1/4 Mile Run:
14.137 @ 94.57 MPH

1992 1LE B4C Police Camaro RS - 305 TPI 5-Speed

 

Maybe slightly, but not much. Probably the increased weight will offset any traction improvement. On the other hand, if you do things that actually do improve traction (LCA lowering brackets and sticky tires for example), the car will bend and maybe even break in places without SFCs. It's a little like using a forged crank instead of cast: by itself it won't lower your ET, won't give you a single HP, but when you do pile on the things that really do increase HP, it can withstand them that much better.

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"So many Mustangs, so little time..."
ICON Motorsports

 

SFC will stiffen the body, keeping it from flexing. It's an improvment over a factory setup but SFC alone aren't guarenteed to see better ET.

The key to getting a better ET is traction. Anything you can do to improve traction will lower your 60 foot time. SFC are only one part. LCA and relocation brackets, and an aftermarket torque arm will also be needed.

If 60 foot times are poor because of wheel spin then slicks are required.

Most of the time all these suspension upgrades will only see a slight improvement in ET. It depends on the rest of your engine, transmission and rear end gearing. The improvements you're more likely to see is consistancy.

Speed means nothing in a bracket race but having a car that runs consistant from round to round is hard to beat.

Where you're more likely to see improvements with SFC is on the street or road course (autocross) racing. The stiffer body will be more responsive in turns.

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and check out the race car

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block

Best ET on a time slip: 11.242 altitude corrected to 10.89
Best MPH on a time slip: 121.52 altitude corrected to 125.89
Altitude corrected rear wheel HP: 497.9
Best 60 foot: 1.546

Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley