Hi,

I have seen a lot of converson topics on converting my D16y7 LX to EX exhaust and just wanted to be sure I had the basics down.
First of all, the car is Automatic, so I am only doing this because the catalytic converter is bad and the header has a crack right in the middle of the center 2 exhaust outlets.

I have a list of parts, from eBay, I know, I know, its cheap for a reason but if it gets the CEL off and gets me me more miles out of my civic then I'm all for cheap. lol

Here are the list of parts:

EX header: https://www.ebay.com/itm/FOR-CIVIC-D15-D16-SOHC-BLACK-COATED-EXHAUST-MANIFOLD-4-2-1-HEADER-02-BUNG-GASKET/400770073380?ssPageName=STRK%3AMEBIDX%3AIT&_trksid =p2055119.m1438.l2649

EX Catalytic Converter OBD II: https://www.ebay.com/itm/1999-2000-Honda-Civic-Si-EX-Catalytic-Converter-Direct-Fit-Heavy-Duty-OBD-II/282016313790?ssPageName=STRK%3AMEBIDX%3AIT&_trksid =p2055119.m1438.l2649

O2 sensor extension cable: https://www.ebay.com/itm/32-O2-02-OXYGEN-SENSOR-EXTENSION-HARNESS-4-WIRE-FOR-CIVIC-INTEGRA-PRELUDE/182439231755?ssPageName=STRK%3AMEBIDX%3AIT&_trksid =p2055119.m1438.l2649

I also needed new o2 sensors and couldn't pass up this deal, so I have already bought these:

My questions are, once removing all the old LX parts, will these list of parts bolt right up? I haven't really noticed the exhaust, despite the many times I have been under the car for oil changes and such. I just wanted to know that once I start removing the LX exhaust parts, are these parts that I have listed going to just bolt right in. If not, any parts suggested would be appreciated.

Lastly, for the O2 sensor extension cable, it lists it will fit a 99 civic, but says 5 speed only. Why would that matter? only wondering as I am fully capable of clipping the O2 sensor wires and extending them myself with excess wiring that I have lying around.

Thanks as always everyone.