Anyone here have Magnapacks or know about them?

tiresmokr, i believe the person you are referring to is MACABOSS. as far you're exhaust system goes i wouldn't go with the 3" pipes i think you'll be losing to much backpressure, the engine needs some backpressure for scavenging exhaust out of the cylinders and the 390 is not the most efficient in the exhaust department anyway, for sure you would be killing a lot of low-end torque which is waht you want with a 4x4. i wouldn't go any bigger than 2-1/2 personally. as far as the magna packs go i haven't heard any vehicle that has them, but i can tell you from personal experience that i HATE glasspacks of any kind because some dumbass redneck in an elcamino tried to race me one time and when he drove by rolled down window it almost ruptured my ear drum it was so loud, by the way he had some of those 4" echo chamber tips exiting to the sides on it. anyway i'm partially deaf in my left ear because of that, hindsight being what it is i should have raced him, i would have easily smoked his dumbass and not have hearing problems now. just my opinions so take them as you will

Running that 3in pipe with a pair of Magnaflows will be setting off the Bells and Horns half a block away.

I love the Looks in the Rearview's as I roll up at a Idle behind Them.

PB

Lookin for me.....Im running Magnaflows on both the Shelbys.....

They sound different on a old school big block then they do on a newer car.....

I am running Magnapcks on the 350 and flows on the 500......

ON the GT350, which is pretty stock, you can hear them all that much at idle...on the 500 though......you can definitely hear it and when I throw a rev it scares small children

BTW- go 2.5" ...Im running a high compression built 428 and Im only using 2.5 inch piping.....

You only need to look at 3" once you get up to about 600-650hp levels.

Run 2.5" piping with the Magnapacks and you will be very happy.

You will hear it at idle and it will scream when it is wide open.....in fact wide open it will almost sound like there are no mufflers at all......but smooth....

if that makes any sense