Well with my turbo setup I had I was going 2.5" dp to 3" piping and a dynomax superturbo no res or anything, but now that Im supercharging my plans are gona be different obviously lol.I have an isuzuperformance header that bounces off my subframe cuz its hacked together lol, no cat with a 30" glasspack with 2.25 piping, back to a dynomax st. It wasnt bad before but the glasspack got kinda broken in, and theres some leaks so Im just gona do my exhaust again. Heres what im thinking:

my stans header, I have another 2.5" downpipe with hangers welded on so it doesnt sag down
catco 2.5" cat, or should I go magnaflow? I had one before and it added a bit of rasp
custom tubes 2.5" catback
flowmaster 40 or something chambered

I know alot of you will say flowmaster will sound bad, but every 4 cylinder Ive ever heard one on didnt sound bad IMO. I know their loud, but they have a tone thats not raspy and ricey, but more like a drone which I think sounds better as I hate raspy sounding. If theres any kind of rasp Ill add a small res, but Id like to hear it with a flowmaster or maybe some sort of dynomax chambered muffler. It will be all professionaly welded instead of myself next time haha. And Ill be using my header unless anyone has a dc 4-2-1 theyd like to get rid of

The Dynomax is well-favored over the Flowmaster in terms of flow alone with most. But as for the note, I'd suggest going with a resonator between the cat and the first turn for the axle, just to keep the noise level down. Some guys have used a 31" glasspack in this area by moving the catalytic further forward (Don't worry, it won't harm anything). BTW, I dig how you want the exhaust to sound: Like those old english sports cars, deep & burbly. It sounds alot better than the tinny rice sound those chitty aftermarket "Compact Performance" mufflers promote ad nauseum. (Heh, heh) In fact, an import with a broken flex tube sounds better than those damn fart-cans!

Go beyond the "bolt-on".