ill Just report on the progression of my car. I bought the car with a modified intake. The stock intake tube was replace similar to the Pedro mod. The first thing I did was de-snorkel. That gave the intake more roar and you could not even hear the stock exhaust. I then bought the cheap $250 dollar eBay muffler. It was louder and sounded good except on the freeway it had a loud resonance around the 3k to 3.5k range. I later added both cat bypass pipes and a k and n filter and the car not is much quieter at 3k on the freeway but overall sounds great. I’m guessing if you still had resonance you still had the pre-cats in your headers. Again I’m just reporting my experience with my 98’ 2.5 boxster.
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