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Old 04-16-2019, 07:53 PM   #8
DSG2003Mach1
700 HP Mach
 
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Join Date: Nov 2003
Location: Orlando, FL
Posts: 8,384
Re: Help deciding on an exhaust

Quote:
Originally Posted by 311-420 View Post
The SLP powerflo catback sounds good, so do the steeda catbacks and magnaflow catbacks. They all have the highest flow characteristics (straight thru design) with a sweet growl and zero rasp, no matter what type of mid pipe you use. The larger size of the muffler casing along with the packing material inside eliminate the unwanted rasp. The full stainless steel construction also gives a beautiful "ring" that aluminized steel doesn't.

Magnapacks sound good, but only with a stock 4 cat mid pipe. Aftermarket H pipe or x, catted or offroad, doesn't make one bit of difference, will give off rasp with glasspacks or resonators. The rasp people mention is caused when you pair an aftermarket mid pipe with glasspacks (aka stingers, magnapacks, slp lm2) or resonators (lm1).

Slp lm1 isn't a muffler, it's not even a glasspack. It's just a resonator. The only way those may be tolerable is with the stock 4 cat mid pipe.

I use the magnaflow catback and love it. It drones a bit on the highway, but they all do. Some more than others, but these are a good compromise. Not until ford went to an axel back design (on the 05+ cars), which moves the mufflers to the back side of the rear end, did the drone issue get "resolved".
interesting info, never knew there was a sound quality reason to put the muffler after the axle, I assumed it to be a packaging issue.

Although I dont like your post about magnapacks not sounding good with anything but the stock midpipe as I have longtubes with a single cats in the midpipe. I had been thinking about trying them again
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03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc...

'12 F150 FX2 Supercrew with Ecoboost daily beater
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