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The effect of an empty CC
Long winded introduction to my question follows...
The Banks monster exhaust is 4" but necks down to 3.5" to mate up with the stock CAT (after cutting 7" off the stock CAT flange). That's how it's currently installed on my truck. But I'd like to try it without the CAT (off road only of course).
Banks sells a CAT test pipe (nice name eh?) that I was going to try but the dimensions of the pipe didn't make sense. It was a 26" x 4" pipe. The CAT (after modifying for fitment to the Monster exhaust is only 21" long and has 3.5" end pipes).
Turns out that the BANKS test pipe doesn't mate up with the existing Monster exhaust since it necks down to 3.5" for the CAT. So the Banks sales guy called me today and said he went back and asked the engineer how it was supposed to be used and the engineer told him that the pipe is intended to slip OVER the 4" portion of the Monster exhaust past the 3.5" reduced sections and that I should cut off the 3.5" neck down sections of the Monster exhaust that the CAT mates up with...
Well at that point there'd be no going back to the CAT at all so it's not much of a "TEST PIPE".
Soooo here's finally my question: I have a used CAT that I purchased locally and I was going to try and use IT as a test pipe by putting it on a weight loss plan, but I'm concerned that the resulting hollow bell would create damaging resonance in the exhaust flow.
Has anyone actually run their truck for an extended period of time with an empty CAT in-line without problems? Did it drone, and more importantly did it result in any cavitation in the exhaust flow?
Please refrain from Banks bashing. I know there are many who don't like their products but I've got to live with my choice at this time and can't afford a different exhaust. Just reply to the question if you have an answer.
2005 F250 XLT crew cab used for camper towing, kid hauling and commuting:
Banks Monster Exhaust, Banks Ram Air Intake, SCT with tunes from Innovative Diesel, Zoodad mod, High Idle Mod, Reverse light floods, ARE Shell, HAM Radio Antennas (80m-10m screwdriver, 2m, 440, 6m whip)
First 25k was run on Biodiesel but it's too much trouble so I'm dino-diesel only now > 50k