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I made my own bypass pipes from 2" stainless to match the after-market headers I put on previously. Had to modify the way it connected to my still stock muffler, we ended up making flanges for the back end of the bypass pipes and attaching it to the muffler like that rather than with the u-bolts.
The results???
Honestly, the sound is not a lot different, slightly improved but nothing dramatic. I am sure there is some extra power without the cats, they are quite restrictive components, but not enough for the butt dyno to really detect it. The weight saving is an obvious benefit, and was enough for me to justify the mod. Then again, in Australia we do not have to go through any annual compliance checks, once a car is registered it will never be inspected as long as the registration stays paid up. If I had to take them on and off every year I would not have bothered with it.
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