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IIRC, it only cost me a couple of hundred dollars to get an Liverpool Exhaust to fabricate a custom stainless resonator for me to fit in the available realestate that I had under the car I actually watched as they did it, took about 1 hour to cut up the material, tig weld the body of it, and then add it to the exhaust 4"in and out, with a packed 5" body, that was about 12" long In the end, it is some blindly simple sheet metal work for an exhaust shop, and some welding
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Highest combustion temperature is achieved at 14.7:1. (or, I should say, lambda=1, because 14.7 is not constant for all fuels). NOx increases exponentially with combustion temperature. So it is in the engine designer/s best interest to find a way to operate at lower than stoich max temperatures if they want to minimise NOx. If you want to minimise CO, you really need to run at least 14.7:1. Any extra fuel can realistically only ever report to NOx. O4 HCs if you are sufficiently sub-stoich, or if the engine's fuel-air mixing is up the shit. All of this presumes that the catalyst is not doing anything, of course. In reality, the cat is there, it is doing things, and how capable it is of eliminating either NOx or CO will depend on its age, quality, design, operating temperature, and how much the engine/ECU is designed to help it along, with fuelling strategies, air pumps, etc. And of course, RBs, even those with very capable aftermarket ECUs, usually don't have anything to help. They are just tuned to make power. -
It's... way cheaper than what SP have on their website? I can only imagine if I say "can you make this muffler, but entirely different dimensions outside of the spec you offer as customization on your page" it would get even more pricey. I was looking at their race mufflers or their 'ultra quiet resonators' which are just smaller mufflers. They start at $166 USD which is $264. SP mufflers resonators start from $299 and are too long/not wide enough/can't be made short enough. -
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