2005 Silver Lightning Xterra SE
Join Date: Nov 2017
Location: Spring, TX
If you are going to do secondary cats, dont do the primarys, go with long tube headers.
Chop out the oem old secondary cats and install the magnaflow cats, extend your O2 wires and set everything up like stock.
Sensor one is located in the long tube collector, extend sensor two and place them after the mag flow cats in the b pipes.
This retains oem style placement of the sensors before and after cats, while giving you long tubes, high flow cats and a bolt in setup.
If your going to pay a exhaust shop to cut out the oem muffler and replace it, by the time you add the cost of the muffler and labor, buy a doug thorley catback.
I looove mine! Its quiet at idle, good deep notes when cruise and sounds awesome at WOT. Just need to cut the final tip pipe of the catback (its to long and extends past the bumper, i cut mine with just enough pipe after the resonator to allow the slip on tip to fit) and get a slip on dbl wall, rolled 45* turn down tip. And all looks stock.
I found one at orileys that fit the DT pipes perfectly, i couldnt use the pinch bolt, so i just did a simple tack weld in three location around the pipe to hold it on.
Will save ya money and you can do everything but the cat weld in yourself.
If you plan properly and use female/female pipe fittings on the cats and pipes. You can even do that yourself.
Everything retains its bolt in properties and you gain quite abit of power.
Be smart unlike me and order atleast 5 multilayer steel gaskets for the pipes.
The hanger rods for the DT catback was abit long and was causing the pipes to fit funky, thus creating a easy escape at the gaskets for the exhaust gasses, i kept burning gaskets.
Had to cut the hangers and remove 1/4" then weld back together to releive the funky angles and seal up the gaskets properly.
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Last edited by Ezdaar; 05-21-2018 at 08:28 PM.