tuning my celica.... Options

[turbosprentice]

well, im thinking about doing a downpipe. i need some help or advice. i think what im doing is basic tune up. im thinking about getting a new header, a high flow cat conv, a custom downpipe and exhaust system. what type of brand is best for what im getting? are all of these good for my car? im also wondering if i could get the car to rumble. is that possible for my celica? i've seen subaru and evo's that rumbles and i was wondering if anyone has done that or if it's possible. im also looking for new rims, shocks or coil over. does anyone have any suggestion of what i should get or any type of brand? im quiet new to all this tuning. i would really appreciate if someone would help me. i've found a few sites for what i have in mind but they're in the high range. im wondering if anyone has any good sites that i could find anything cheaper and more affordable. -john