Now what?
 

I know these questions have been asked a million times, but I couldn't find what I'm looking for in a search of old topics. Any advise would be appreciated.

Now that I have my Cobra, I'm looking for the best mods (just like everyone else).This is my 2nd week of ownership and so far I've only added a K&N. I will have a Supercharger within the next year, probably Vortech S-trim (While I'm thinking of it, will my stock pistons hold up to the 8psi supercharger?). I want to start with some less costly mods like exhaust, underdrive pulleys... Would a set of flowmasters on my stock exhaust do me any good or do I need to go all out? If so, Shortys or long tubes?(I will be running cats) I'm not looking for loud but a mean rumble would be nice. HP and torgue gains are my priority. What kind of increases can I expect from different exhaust components?
What are the best bang for the buck mods I can do?

If you want to do your exhaust, I would recommend some long tube headers(ceramic coated, of course.) Dr. Gas X-pipe, and the mufflers of your choice. That should give you a good increase in power, great sound, and get you ready for your next mod's. Then get some gears, I would recommend some, but it all depends on your future mod's. And 8psi, properly tuned, should be no problem.

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1989 GT, not stock.

2000 Camaro SS-A4, 13.4's bone stock.

1989 Chevy S-10, EX. Cab-383(500+hp on motor), tubbed, trick flow heads, trick flow pistons, etc... autometer phantom gauges, "built" 700R4, roll cage, lexan back window, corbeau seats, R.H.S. 5 harnesses, Fuel cell, convo pro wheels, 15x14's with 29x18.5 M/T'S on back, 15x4's on front, nitrous, and so much more!

You're stock bottom end should hold up fine. I'd go with a set of 3.73's.

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1990 Mustang GT 5.0
1966 Mustang 200 six
2001 Ford F-150 5.4