I have done it on a few cars. Depending on the configuration of the cage and the door opening, the easiest method is to cut all the forward bars immediately in front of the main hoop and take the cage out in two pieces. Then you grind the excess off the main hoop, re-notch the forward tubes, and weld it all back together. My 200SX is one its third tub this way - the cage is just 1.5 inches shorter front to back . If the door opening isn't big enough to allow this method, you can cut the forward tubes closer to the middle and sleeve them, or alternatively cut out the problem tubes entirely and replace them. I've done it all three ways, and never had a problem with tech on any of them.
Tom Lyttle
Decatur, GA
IT7 Mazda - 2006, 2008 SARRC Champion
ITS Nissan 200SX - finally running correctly
FP Ford Capri - waiting for a comp adjustment
GT3 Dodge Daytona - what was I thinking?
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