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I have a 2003 impala with a 3.4L, should i straight pipe it? One of my friends straight piped his car from the resignator and it sounded good, but he has a jetta. Being totally different cars would it sound better than stock on my impala and will it pass inspection. And if i did should i straight pipe it from the cat or the resignator?
 

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No
Basically you really cant b/c the way the exhaust has to run, unless you want to drag/scrape over every bump in the road. There are a bunch of aftermarket setups, or just swap the downpipe, remove the u bend and replace the muffler
 

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i have a 2000 impala and I put straight pipes on it and it sounds awesome. not too loud, but does bring on check engine light. not sure what thats about...
 
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