dynomax ultra-flo's are pretty quiet, so are magnaflows
Not a Mustang, but keep in mind this is through 3-mufflers and two high flow cats. A little tough to hear over the blower when you're in front of the car, but you get the idea at idle in the fist video and after half track in the second.Do you have any sound clips of your magna flows? Do you know where I can find some clips of the borla?
Sound Off in Quietest to Loudest (Decibels):
1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).
Well with a o/r h pipe, nothing is going to be really really quiet.
Dyno max SUPER TURBO is not on the list. They are MUCH quieter than ultra. They are THE QUIETEST and you keep your HP.
+1 on the Dynomax Super Turbo's, quiet and good flowing
I used to have the Borla XR-1's on my cobra and with an offroad x-pipe you had to get the car over 3500 RPM's to actually hear the car. They got a lil louder when I added the prochamber, but still very quiet none the less. I sold my set of them a few years back. Seems weird I went from that quiet system to now having the prochamber still and adding SLP Loudmouth I system which is now hacked into turndowns and the car literally wakes up the entire neighborhood.
I don't understand why you want to limit yourself to keeping the current midpipe. Why not just get some high flow cats? That will quiet it up nicely and cost about the same as a new cat-back setup.
I think a 1993 Escort station wagon would be quieter on the exhaust end of things ;-) It's actually a great little car...
But seriously +1 on the high flow cats. You could even have some welded in to your current setup, which is a cheap option if you can weld or know someone who can. Pypes sells them individually as do others I'm sure w/the correct inlet/outlet diameters.