i want to get full exhaust


i'm thinkin of getting just the catback to start cauze i don't have the cash yet for the whole system.

i dunno what cat back.
i'm thinkin of

flowmaster
random tech
mufflex

i want it to be crazy loud when i get on it but not to loud at an idle.

i also wanna get a high flow cat itz most likely gona be random tech cat.
i then want to get headers later, i'm thinkin about edlbrock but slp i hear are really good..

the car is a 89 iroc w/305tpi

i wanna know how much of boost i will feel from the whole system , will i go from 14.27@96.4 to 13.9@100 i'm hoping for a .3 gain in the 1/4 is this possible.
i currently have a 2.5" setup on the car

 

i would go with flowmaster or hooker, imo they sound the best but i must say the dynomax sounds pretty good too and they arent that expensive. you can get all kinds of different headers, just depends on how much you want to spend. slp are very good but they are quite expensive. if you search you can find out about all the headers and everybodys oppinion