Re: airshocks,magnaflow muffler
You couldn't make me use air shocks, in my opinion they are one of the worst add-ons you can use. They can be extremely dangerous in some situations. The shock mounts are not designed to support the weight of the vehicle, just suspension rebound and compression.
The reason I'm so against them is I lost one of my best friends in our first year of college to a car accident due to air shocks. He had a '76 Ford Elite that he used them on, one of the shock mounts was ripped off the axle in a corner on the highway and threw him topside into a bridge pillar. Killed instantly, and we did check the condition of the mounts before installation.
I still can't figure how I wasn't with him when it happened, we were pretty tight. Obviously my view is tainted, and only my opinion so take it with a grain of salt.
I've also used airbags on a Ford and was very happy with them, I would go with the airsprings before the airshocks.
I have a Flowmaster BigBlock series two 2.25 inlets and one 3" outlet and am very happy with it. It's not loud in the cab, not like the 40 series Flowmasters. But when you get on it the muffler sounds great, I get alot of looks and thumbs up from other car nuts when they hear the nice tone of the muffler.