I have a 98 F150 with a si/do flowmaster 40 series. The cats are stock and I really dont wanna mess with them if I can help it, but I want louder. I know Imco makes a glasspack that has the y- pipe built into the end of it. Will this be very much louder than my current muffler? I don't want to go true duals either.

 

Glass packs or straight pipes, it don't get much louder than that.

 

Put on high flow cats. Randomtech makes some super highflows.

Straights and glasspacks would be loud but will sound like crapola.

 

My neighbor has a Dodge Ram Hemi with dual Vortex Cherry Bombs. His truck shakes the windows in my house when he starts it. Vortex is now the parent company of Cherry Bomb which are the loud as hell mufflers I remember when I was in HS. If straight up loud is what you want, I think these things are as about as loud as it gets while still being street legal.

KC-10 FE out...