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first the easy one... Catco make a highflow cat with your choice of pipe sizes, and you can have it welded in. You need to check where the cats are on the spec v, i havent even looked myself.
CAI- the bypass valve works very well, you just have to be aware of water on the road, should you end up in deep water you need to just get off the road. I have no bypass in my integra and therefore when the water starts to puddle that car cant be driven.
Custome exhausts have been a topic in here a few times, yes they do get you horsepower, how much you cant tell unless you dyno the car. Most muffler shops have some idea of how a highflow exhaust is suposed to work, so they should steer you in the right direction. If not get a proven kit, like the ones mentioned in my topic "exhaust".
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-- 2002 SE-R Spec V
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