H pipe with cats will be the quietest, but either an X with cats or an offroad H will be better. Off road X is the loudest style of midpipe. Regular Magnaflow is one the quieter cat-backs, so it's probably the offroad X that's making it too loud for you.
yep. i put an O/R pipe on my Fox with BBKs and a Magnaflow CB. 200kms, way too loud, back to stock h with cats. Much better!THIS!
It's almost a daily occurrence when someone hangs an off-road mid pipe thinking it will add all kinds of juice at the rear wheels before they realize the downsides are not worth the 10-15 hp added to a 600+ hp car. Adding quieter mufflers will be just as restrictive as a pair of cats. Better to have clean air that won't smell like rotten eggs and be legal plus the tree huggers will be disappointed to learn your socially irresponsible Mustang actually passes emissions.
Get a 2 1/2" catted H like what MRT makes which fits in the stock location. The 4 cat 2 1/4" OEM mid-pipe has nasty kinks and are not mandrel bent. Plus the H pipe maintains that nasty pissed-off Mustang exhaust note that Camaro and BMW owners dread! I never cared much for the sound of an X pipe but that just me.
Maggie cat backs are very low restriction straight thru muffles that are fairly quite during cruise but produce a nice growl when you step on it and will have the women gathering the children while sending cats scurrying up the trees at WOT :mj: I had this old fart pull up next to me in an overstuffed benz and actually comment how much he liked the sound of my Cobra :rockon:
I was in the exact position you are once. I had a Magnaflow catback and for me it was too loud. Plus it produced an annoying drone around 2,200 rpms. Had it literally for a week. Sold it and bought a Steeda catback (with cats) on advice from a fellow SVTP member. Perfect....for me. Idle was a tad quieter, but absolutely no drone or raspiness. WOT was just right; not as loud as the Magnaflow. If you can afford to go with a new catback, seriously consider the Steeda catback. I do not advise going with an 'offroad' cat-delete option as it will increase the noise level. Trust me on this. Also, be aware that an H-pipe has a different sound than an X-pipe. I always thought of H-pipes (ie. MRT) as having the traditional Mustang Muscle sound. Whereas an X-pipe has more of a raspy Nascar-like sound. But every X-pipe is different, with varying levels of raspiness, with Steeda being the least raspy. Ford Racing used to sell a nice catback that was in-between the stock noise level and the Steeda; quietest by far. But it is no longer available.
Steeda sold catted "cat backs"? That doesn't sound right. (no pun intended)
We would also recommend going back to stock midpipe. This is most likely what is causing the exhaust to be too loud, since our exhaust are typically always more on the quiet side.