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I am getting ready to put these on my car tonight, I have heads/cam on my car and now have the SLP Loud mouths and they are obscene loud so I went with PRT's because I still want it somewhat loud but not topfuel/nascar loud
from my own personal observation.. on a 1-10 scale, 10 being the loudest..here is how I would rank them (with long tube headers that is)
Loudmouths and BB Bullets = 10
PRT's= about a 7 or 8 just right for me
Corsa Indy= about a 6 (at WOT they are probably 7.5 or 8)
Heres a link to a post i made, Lost of useful information in there. The chart is really helpful to get a good comparison, and my source links are at the bottom...
I have them on my car w/ LG Pro's and an off-road. It has a much better sound at idle, it sounds very good @ wot and is almost as quiet as stock at 1600-1800 rpms. I could not have asked for a better sound. And I'm sure the up coming cam install should wake things up a little more.