By removing the catalytic converters you decrease resistance in the exhaust track. This will free you up a little horsepower, but won't really be appreciated until you have augmented the remainder of your setup (TB, MAF, heads, intake, etc).
In the short, cats aren't going to effect you negatively, and might actually help just a bit. However, if you have to pass emissions, you won't be able to pass a visual inspection. However, I don't know anything about Canada's emissions laws.
On my car, I cut the heat sheilds off, cut a hole in the converter housing, pulled out the packing, and welded it all back up including the heat shields. Also, all cuts were made on the side that is up against the car and hidden by the heat shields. Visual isn't a problem, but I wouldn't have a prayer in a sniffer test.
--nathan
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'91 GT, Coast 347, 9.5:1 compression, full intake, Wolverine 1087 cam, exhaust, Keith Craft ported Windsor Jr. Irons (235 cfm intake, 195 cfm exhaust), AOD, PI 3500 converter, Lentech valve body, 3.73's (4.10's in the works), and Yokohama ES100's out back.
Daily Car: '04 Infiniti G35 Sedan 6MT
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