Test Pipe

I meant to post this last night, however I got busy, trying this "exercise" thing again. Anyway we picked up what's suppose to be a Spoon Test Pipe, there really is no difference in brands, It measured as a 63mm I think and fit perfect. Since this went on my wife's white S2000, I was concerned with the check engine light coming on, so I wasn't about to spend $50 plus on a spacer when I spent $8 at NAPA and made my own in 5 minutes. Here's what you need. Go to NAPA and get a "Spark Plug Non Fouler" (PN- 73-2442) all you need is one package even though it comes with 2, take a drill bit and drill the inside out of one then thread it into the other. (You don't need to use the lock rings it comes with) The one that you drilled will be the one that the O2 sensor threads into and then the whole assembly will thread into the test pipe and no CEL will occur. The O2 is your secondary and throws a CEL code when a test pipe is on the car because it "sniffs" the exhaust to make sure the cat is working so when you space the O2 out of the exhaust it doesn't pick up as much flow and thinks there is still a cat. The only O2 you should be worried about is the primary on the exhaust manifold collector, it's the one that adjust your air/fuel etc. My wife's white S2000 has a stock exhaust manifold and cat back, but you are able to slide the exhaust enough to remove the cat and install the test pipe. The only thing I recommend is to loosen the O2 with a 22mm wrench and then drop the cat and finish threading the O2 out and vice versa, so you don't twist the wires too much. This really woke this car up, the power band feels much smoother and gives the exhaust a little more tone. I highly recommend this to anyone that either wants more tone out of a stock exhaust or wants to gain a few extra ponies, there really isn't much more to say about this other than there is 70mm pipes available for larger exhausts, and you should be able to pick one up used on S2KI for $50 bucks or so, don't waste your money on any name brand one like a J's Racing or whatever. Also don't buy an Invidia with the build in "CEL fix" expecting that to work without spacer, (nothing wrong with an Invidia. It just will still need a spacer) I have yet to see anyone have any luck with just the built in "fix": working. If you just want to add the fix after the fact, just reset your ECU by disconnecting the battery and the CEL should clear.