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So i just got my exhaust set-up installed, Apexi Ws2 full cat back, random tech hi-flow cat, and dc 4-1 header. I've seen many videos on you tube and the sound is much deeper and throatier. Is this due to the exhaust just breaking in and mellowing out ?

 
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Yessiry. I put new exhaust on the Civic and my Tahoe. Civic's exhaust is getting deeper yet raspier and my on my Tahoe I put a 40 series Flowmaster setup and when I drove it the first time I was like "ehh" but, now it sounds like a damn race truck ( it's tucked and dumped with one muffler for the full performance gain) and not that dual, chrome, tipped stuff you see on most trucks with Flows.

 
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you have a hi flow cat so ofcourse it will sound different. also yes after breakin the sound will change, usually it gets louder.

 
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oh okay cool, yeah other vids i saw also had a high flow cat so i would assume mine would sound similar, but yeah I've heard usually after about the first 1,000 miles it will be broken in and sound nice

 
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i have the same exact setup... i just put in my high flow and header 4 weeks ago and ya it gets really loud, mainly between 1-2 and 3-4 grand but im happy with the sound because it still sounds normal outside but inside its a different story

 
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my exhaust got louder when i drove 100 miles in one day

 
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haha alrite sounds good, ill be looking forward to itt!