Compression Ignition Addict
Join Date: Aug 2011
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I purchased a 4" Diamond Eye kit without the cat or muffler (straight pipe) and welded the cat back into the system after opening up the inlet and outlet of the cat to the new 4" diameter. Works well and only took a few minutes extra to stay legal without going all the way back down to the stock sized piping. I did run with it straight piped first and noticed a few degree rise in EGT after reinstalling the cat, but not enough to make me worry yet.
One thing I am considering doing is making a drop out section with two of the 4" band clamps to allow me to easily swap between kitty and no kitty... I have an extra section of 4" exhaust pipe to try it with, so I might as well...
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