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Potential Horsepower Gain of Long Tubes with Factory Cats?

1031 Views 4 Replies 5 Participants Last post by  charlie_gonzales
I have read about the considerable power gains from long tube headers on these trucks. However, I am curious as to how much of those gains may be attributed to the additional exhaust flow of an off road y-pipe or high flow cats? I have been considering installing LTs, but I would be reusing my stock converters, whether in a shortened factory Y or welded into an O/R Y. How much power do you guys think could be gained from LTs while retaining factory converters?
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