[GBrown1320]

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?

 

[garnerZ71]

I believe 20 lb ft and 20 hp is around the standard gained. With cats or without I'm not sure the effect.


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[scarber08]

The cats on our trucks flow good enough that I doubt it'd be more than 1 or 2 hp tbh. The only reason to remove them is for long tubes. That being said, why not get LTs w/ catted ORY (OBX, Kooks)? Unless you're doing the work yourself, shop labor on welding in your stock cats will probably be the same if not more expensive in the end.

 

[Z71Classic]

I have pacesetter long tubes and a offroad y pipe no cats. Very noticeable power gains and sounds awesome with cats deleted and magnaflow cat back.

 

[charlie_gonzales]

gbrown where are you located