1320 Performance S2k Test Pipe Review

I feel confident is saying that many S2000 owners who have “louder” exhaust systems can agree that these cars love to drone. Cruising on the highway at 60mph, can just about make your ears ring.

About a year ago I installed a V-Band clamp near the rear section of my AP1’s exhaust, that way I could easily swap out different exhaust setups for what I was doing. Single exit straight pipe for the track, a muffled single exit for cruising around, and the stock mufflers for stealth!

As time has gone on, I’ve just been leaving straight pipe in, and enjoying the sound of the F20C. But dear lord, that highway drone is terrible. One common solutions to this is to replace the factory catalytic converter with a catless “test pipe”, removing the catalytic converter altogether. This can also lead to a more refined note and better flow (maybe a few extra HP too).

After looking at the options, I considered the Invdia, the Berks, and the Skunk2. But decided to save a few bucks and try out the 1320 Performance 60mm Test Pipe for the S2000. Which came with new hardware, gaskets, and a built in “CEL-Fix”. The CEL-Fix is essentially a little restrictor for the secondary oxygen sensor, which tricks the ECU into thinking the catalytic converter is still present.

Now to the test pipe itself!

1320 Performance shipped the item very quickly, had a live tracking number before the end of the day! Their package was well taped, and once opening the box, everything was individually bagged. Which is good, because the package sat on my door step in the rain for a few hours.



The test pipe itself looks to be of pretty good quality, welds are clean, and appear to have good penetration. Couldn’t find any pinhole leaks! The interior of the pipe is smooth, and is also welded to the flanges. Nice. As for the CEL fix, the test pipe itself has a standard oxygen sensor but welded into it, same deal as the flanges, clean welds. Simple 90° extension with a jam nut to allow you to set the angle of the extension, followed by another straight extension.




Looks like someone outlined the weld with sharpie?

And the hardware?

The kit came with some bolts, washers, and nuts. Nothing too fancy, and some gaskets. The gaskets look to be of good quality, nice donut gaskets, a crush gasket, and a two layer 3-Bolt gasket that looks to be good as well! Oh yeah, and they tossed some stickers in there too!

Installation & Fitment

The installation was easy and (mostly) pain free! Of course, there were some bolts that were rusted together, and needed to be impacted off after soaking it in PB Blaster, but that is just what happens with any car of this age. Just be sure to throw some anti-seize on threads when reinstalling to help you next time!


The only thing I’ll note is the donut gasket took a little convincing to get on, and that I didn’t put on that large crush style gasket. The OEM gasket I took off was the same thickness 1320 Performance provided. Everything bolted up perfectly, I reused the OEM spring bolts, and used 1320’s for 3-bolt flange. The O2 Sensor extender fit perfectly, and can be angled up out of the way for ground clearance!


Post Install Impressions

The 1320 Performance Test Pipe definitely cut down on nearly all of the drone, with a noticeable change in volume. It definitely made the car a lot louder than without.

The O2 Sensor CEL Fix, definitely didn’t keep my check engine light off! But I’m not too worried about it!

Definitely recommend! A clip of the exhaust note can be found here!

Keep in mind the video is with my “track pipe” configuration. So no rear mufflers, just the center resonator.


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