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The combination of a catless header and aftermarket front pipe are going to contribute to the noise, as you've removed the two factory cats. The N1 can be raspy, especially with an EL header. You could try to use the stock frontpipe. Some people seem to have success with the JDL ultra-quiet frontpipe.
If it was me, I'd try the stock frontpipe first, then consider a different catback.
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