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No point in cutting the cat out. Just gut it with a hammer and long screwdriver. The empty cat won't hurt anything. Some tuners believe it has anti-reversion characteristics once gutted.
Gains after tuning on a gutted stock header are similar to most aftermarket catless headers. It will be noticeably louder.
Using the canned OFT tunes aren't what I'd consider to be a good idea, but YMMV. I prefer EcuTek and a proper dyno tune.
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