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Originally Posted by benjaminbreeze
In alberta there are no emissions tests and you can get away with it for now...
UPDATE!
it apears actualy like he didnt remove the precats just the cat so it goes precats into a custom y into a resonator into the magnaflow(Motorsport#).
The resonation starts in/around the y and continues...from behind the exhaust doesn't sound too bad but from the side it sounds like a go-cart...is there too much airflow into the y pipe? or what?
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Replacing the secondary cat with a Y pipe to join the two header pipes is a NO NO.
From another post.
"There seemed to be a few different exhaust mods that had that resonance. The ones where the two header pipes are joined with a Y pipe, instead of joining in the low pressure area in the front of the secondary cat, will have gas pressure problems besides any sonic problems, as the unexpanded gas pressure can travel up the other header pipe to enter the open exhaust valve on that side. While the two header pipes join in the front of the secondary cat, the gas pressure and the sonic wave that enters the other pipe will be at a low intensity."
Harvey.
