[heminut]

All I know is,after spending the majority of my life driving mostly high performance cars and trucks,I fall asleep without my "tunes" from my engine.I keep pretty extensive records and I normally gain 1 1/2 to 2 MPG.The loan exception were my Porches and my interpart racing 240 Z.The 911's had stock and I used an Arbarth on the Z car.My wife,who drives our 02 Dakota with the 4.7 OHC motor says she misses the sound if firced to ride with others.My sons 06 Grand Cherokee with the 4.7 was at first too load on trips and he reversed the leadpipe moving the Flowmaster back 22",which made it a nice rumble and now his wife is happy.I did retain the stock Mopar high performance mufflers on my 67 GTX and my 70 6pack.Both had 440s and the Plymouths had that great sound and with the aluminized exhaust and the great factory freeflowing cast manifolds(the 67 outperformed any headers)made these the absolute best sounding stock system I ever heard.I also have built my own systems on some great motors with info from Flowmasters and I would have to be convinced of a better system.Just my opinion.