A turbo is a very, very good sound deadener. My apexi n1 duals sound very quiet on my KA-T, well.. for being so large they're quiet. I have no cat, but plan to replace my dummy cat (s14) with a hi-flow cat, and expect the noise level to drop even more.
I say wait until you get a turbo and the exhaust, and if it's too loud, then plan on how to fix it. Chances are, it won't be that bad. Especially since you don't live in Cali.
-Jeff
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