Quote:
Originally Posted by axis
The main problem with your "take" is that shorty's don't significantly increase the airflow through the engine. It's debateable whether they flow more than the stock ones at all. For the sake of arguement, lets say they do. They haven't been proven to gain anywhere near the 18hp that most companies claim. I highly doubt you're going to burn up a piston with a 5-10hp gain. The PCM can EASILY compensate for that little of a change.
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...and in addition to the topic, one thing shorties will provide every time is weight reduction.
The real performance gain comes from removing the stock cats. Shorties are not worthless if you replace the stock downpipes, with or without high flow cats. At that point you may as just go with LT's and get that extra 10HP however. In the end a tune will be required.