High flow cats
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#8
Well I have the Magnaflow highflow cats (removed the 4 stock on a 2004 5.4 liter), borla duals, and a magnaflow X-pipe. The truck was quiet but sounded good at WOT until I added the high flow cats. Now it drones big time if you touch the throttle up to about 2250 RPM. My wife refuses to ride in the truck. So, I am looking for two quiet mufflers to replace the Borlas. Hope you have better luck.
#9
If you have a blower are runing a higher comp ratio then Zero cast are the answer assuming you get a tune too go with the mods. Now if you live in a stae or an congestied area where smog testing is used you can still get around a 3 sniff test but a 5 sniff will get you either way. Trust me ive been playing the cat game for over 10 yrs now