I'm getting ready to put an exhaust together.

I have a cobb dp, and will be getting a greddy evo II shortly.

I want to add a mil.spec 100 cell cat to the mix because I don't want the smell of a test pipe.

I also need the exhaust to be very quiet. If this is too loud I will be trying to put a magnaflow muffler where the test pipe would be. If I do this I would have to move the cat down to a section of the cat back so the exhaust flow would go like this.

Cobb dp -> magnaflow muffler -> mil.spec cat -> rest of greddy evo II catback.

Does anybody see a problem with this setup? Also would I need to have a o2 bung welded in to the straight pipe section of the cat back after the cat was welded in, and if so would I have to extend the wiring for the rear o2 sensor and if so is just a matter of cutting some wires and saudering in some extensions or is this getting pretty complicated?

 

ttt

 

I don't understand the whole smell of a test pipe thing. But I really dont sit in traffic either.

At stop lights and such though I don't smell anything irritating.

As for the set up its nothing any reputable exhaust shop could't put together for you rather quickly

 

shouldn’t be a problem, I had to extend my rear o2 wires (before I deleted the Rear O2) I just cut them and soldered in an extra foot which was plenty extra for what I was doing. I have heard that the mil spec cats are pretty quiet so you should be good without the extra muffler

 

Technically you should not cut and splice O2 sensor wires...The sensor actually pulls oxygen through the insulation of the wire to compare to oxygen content in the exhaust...Splicing the wires cuts off the oxygen supply and leads to incorrect readings.

 

Are you serious? That's crazy.

 

If it pulls Oxygen through the insulation where does it go after that? there is no input for it on the plug. after cutting and extending mine I saw absolutely no difference, and it didn’t change the reading on my wideband.

 

HUH . You kidding right

 

i think someone cut the oxygen supply to your brain.....

 

If your going to use a cat it needs to be upfront--or it isnt going to heat up enough/fast enough to function and could cause other issues--ie cel?-put the cat where it belongs---this solves your o2 wire issue and mount the muffler after it..

 

just get a quieter cat back. You are making much more work for yourself.

 

This just made my day, ha.