468BBO

I am running a LQ4, Magnuson MP112 with the 92mm inlet, ported 317 heads, larger valves, etc.
This is going in a 1961 Chevrolet apache pickup. Its time to order mufflers and much to my surprise Borla just told me that I would have to 2 oval XR-1 3" mufflers and 2 Round 3" XR-1 Mufflers as resonators if I wanted it to be a somewhat quiet driver vehicle. I don't mind paying for quality but that's about 1100.00 in mufflers.
Can anyone suggest a muffler for this application that will work fine with the supercharger, be drone free and somewhat quiet at cruising speeds?

tug686spd

iTrader: (11)

The biggest things to keeping the exhaust noise down inside the cab is, run it all the way out the back and using heavier gauge metal on headers and exhaust pipe. The cheap stainless headers resinate a lot of noise along with thin exhaust piping due to the light gauge metal. Most mufflers even Flowmasters arent going to hurt more than 20whp when sized right. One thing you can do if you think a muffler you want may be restrictive is go up in size for the muffler. If running daul 3" exhaust put in 3.5" mufflers. Sounds like your building a driver and not a heads up racer so sound would be more important than hp anyways.

xdanny510x

Pretty sure u can add dynamat to keep the noise level down a bit as well

01boydws6

iTrader: (19)

the 6" od round magnaflow mufflers are pretty quiet while still being straight through. The larger casing size helps keep things quiet compared to a 3"id x 4" od bullet muffler.

I went from a 4" od magnaflow muffler to 6" od Hooker Black Heart mufflers and it was night and day, made the car so much more enjoyable to drive.