Some exahaust questions, could someone give me the run down? Options

[tonytutino]

Ok so here's the plan: i would like to get rid of my stock exhaust piping, get a new muffler ( i got some nasty 3A racing one right now), and get a high-flow cat.

1) i want 2.25 piping so should i buy the 2.25 high flow cat? it may seem obvious but i really don't know.
2) we don't have emission laws here, should i get a test pipe instead? (whats the difference)
3) does the inlet of the new muffler need to be 2.25? alot of the ones i'm looking at are 2.5 and i didn't know if they welded some kind of adapter or something on there.

i guess thats it, i'm a newb when it comes to exhaust...

thanks in advance!

[tonytutino]

thanks alot, this all makes sense now. that sucks about the exhaust projection, mine's loud enough as it is... lol

[Terracar]

Just thought I would add my $.02

I have had a straight test pipe with no cat and with the engine running properly had no issues with emissions. However, I do live in WA so our emissions may be a bit less stringent as other states. I did compare the emission reports from the old exhaust (stock with cat) to the new one (w/o cat) and there was a insignificat difference, with some emissions being the same.

(though I must add this is a 5th gen '91 Fed emissioned 5sfe)

-Terracar