I had that system with 4 in resonator tips on my 3.8 camaro and REALLY liked it. Most people didn't know it was a v6, not motorheads obviously, but still. Don't know about a jeep tho, don't think huge chrome tips would look great on a jeep. And I think they helped the sound a bit. I have the 4.7 and a 40 series on it, and I love it. Sounds great at idle, gets louder in the midrange ( which happens to be where I usually keep rpm under normal acceleration)
And not too bad at highway speeds.
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Super slowmo build, 2006 grand cherokee limited 4.7, flowmaster 40, k&n cai, superchips, shorty antennae, 08 Jk Sahara takeoffs w/stock duelers
Red wk club